Fubiki = better torp boat
Tatsuda = better gun boat

And dont worry about losing 80k on a Tatsuda. You get it back when you sell it.

And IMO Simikaze is superior to both so dont pass on that one.

I would stay in fubuki. I was in same position as you about 2 weeks ago. The fubuki is better because its a smaller target. I had better expierences in fubuki because lots of time i could manage to survive even at 200 or less DP because I'm a smaller target. But tatsuda your just a block shot target. I played it one or two games that was it. I reccomend staying withe the fubuki. You'll get to the next ship much faster. By the way the Simakaze is the best. Especially with engies and lvl 50+ torpers. Torp wall ninja. Not as good askita in torp wall but that thing is a big target. I had lots of times where it was my simakaze and a kita and guess who survived. :P ME!!!!!.

1. I'm much faster
2. I turn faster
3. I'm a smaller target
4. It's harder to hit me in general

PS: DON'T KEEP YOUR SIDES FACED TOWARDS THE ENEMY FOR SO LONG OR YOU WILL DIE. EITHER FACE FORWARD AND CHARGE OR FACE THE OTHER WAY AND RETREAT ( normally while loading ) OR DIE. I normally charge half way to the enemy BB line and launch all my torps. I run off reload and do it again. By the time I'm reloading my third wave of torps my team is winning and charging the surviving ships. Also on the R slots mount hedge hogs because on the way to the enemy side you can protect subs by killing a few subs on the way there or one shot little DDs or CLs. hedgehogs are quite powerful. Fubuki also prepares you for simakaze gamestyle

stay with fubuki

it is all a matter of preference. Sima is a very nice ship if you like torping. However if you are going bb line dont forget to lvl up your gunners and your dp gunners (at some point you will need to play aa and without dp gunners it want be possible). For more info on the dp gunners and how to level them up check the forum for other threads. I ams aying this because dp gunners are very specific on classing if you want good ones.

So back to topic. u r comparing a cl with a dd. Obviously with the cl you will have more space to lvl up your sailors but you will get shot at way more. Also kuma does not offer you the same advantage the sima will offer. Sima is small agile and u can sneak in and out way better than with the kuma. I stayed in my sima until i was able to play with kitakami and i enjoyed it more. Somehow with kuma i did not do as well.

Anw as i said its all a matter of preference. Buy the ships play with them if you dont like sell them back. the credits you will loose are very minimal.

About the exp now: you should always try to keep all your crew on an average of plus - minus 8 lvl away from the lvl of your ship. So if you are on a ship lvl 50 your sailors should be around 42-58 in order to get the maximum amount of exp they can.

I dont know if you have read the start guides on this forum but anyway here it goes. For IJN BB crew you will need following sailor set up:
1 bo
2 main gunners
2 DP gunners (this is optional but since IJN has one of the best aa guns and some of the best aa bb cover ships you should definetely have them)
5 engines (+12 base minimum as the growth is kind of low)
3 repairers (+12 again as you will want the best possible repairer rate)
1 scout ( don neglect to get one as IJN BBs up to BB6 have the most space for scouts)

Enjoy the game and welcome to IJN.

regarding the dp gunners i am not sure how much the reload should be when you will class them to dp gunners. What i did is left them as arm. sailors all the way up to lvl 89 (yamato level). The reasson is that before yamato the other bbs dont have good space for aa (the exception here would be the Premium BB but that one sucks big time. Dont bother getting one if you ask me). You could also class them at late 60s level if you want they will not be bad at all. What you need to look at is the reload stat when you are rolling for new ones. The reload growth you should aim for should be 11+ or 12+. The aaw is not really activated if i am correct (the rest of you reading correct me if i am wrong). Best option if you have the olives is to buy a pair of elite reload gunners.

As far as the engs and reps you should definetely roll some more. Keep in mind that for bb6 you need 14 sailors to be able to drive it ( bo gunners at lvl 120 and the rest lvl 115). So its better to get prepared and start rotating your sailors so they all stay near the same level. And yea the growth should be for engs +12 same as for reps. If you are lucky and you find some with 11+ rep 10+ rest and 12+ eng it would be great as they will add repair ability along with being engines.

By the way completly off topic. If IJN is your first nation you will get frustrated pretty soon. The ships are made out of paper. You will have to get used to the time the shells on the air (around 5-7 secs so you will to predict where the ship will when they land). Most people will tell you that is a hard grind to bb6 (KM being the hardest and then IJN). The only thing i could advice you is suck it up man and play. BB1 sucks big time but with bb2 (Fuso) you can make some good games when you are lucky. BB3 is much better and from then on bb4 -bb5 are awesome ships. Just go through some tactics in this forum and you will be fine.

Also, you might want to start a second nation (find one with good aa -KM has some of the best ship-platforms for this as well as some US and MN ships do) and lvl up a pair of aa gunners so you can lvl up your supports. You should always have your main gunners ahead of your bo lvl and the supports if not at the same lvl then close by. Dont get a restorer its a waste of money.

If you need anything else you can send me a pm.

PS> if you are on Nebby and you are low on credits points msg me to give you some.