Musashi is = to a Yamato, they use same guns except it have more support slot and a little more DP

Shinano is a kinda buff up BB4, it has its own gun (cloned from IJN lvl 110 guns) and  it have same range of SY and have a nice spread 

and their lvl Musashi is 96 and Shinano is 99 

Musashi - max speed 40( but more bulge than Yamato)
Yamato lvl91 gun
better structural strength than Shinano 
8 support slots

Shinano - max speed 39
Enhanced lvl110 20" twin equivalant(crazy damage per shell and BEST spread) 
also lvl 100 18.9" tripple available but you should use 20"twin. its the best.
Weaker structural strength 
7 support slots

Personally I will take Shinano over Musashi. Musashi is just good grind ship until you get your Super Yamato..but going from Yamato-Super Yamato doesn't take long time with these frequent exp events. However, Shinano is good playable ship even when you have Super Yamato. Its 20" twin's damage per shell is really fantastic so you want to keep play with it for fun.
*Shinano- great toy
*Mushashi- grinder ship between Yammy and Super Yammy but will be ditched after u get your Super Yammy. 

Thank you for a fast reply.
My final follow up question is:
Shinano vs SY, what ship would you pick to be most competetive?

Super Yamato is more competitive than Shinano generally.(1 more slot, usually 1-2 knots faster, more scout space)

but if only your aiming is really good(i mean REALLY) enough to land ur salvo on enemy ship no matter how fast they are or how big they are...... Shinano wins.   

Thank you.

phantom3553 ijn 110 cloned guns? so shinano has unique 20" duals?

for lvling purpose i think you should use the musashi over yamato, the extra dp, extra slot and more binds really are better

i feel the shinano needs to have support that are atleast lvl 105+ to make it a effective ship

the shinano can blockshot but your aim needs to be seriously top notch to land the shells

but i will comment on that ship when i can actually play it

the musashi is a good ship to play in, it plays exactly like yamato but musashi benefits from 1 extra support slot and more dp,  i do love this ship.

I was very effective in Shinano with 90's crew.  For a long while I could only do 35 knts... but it didn't matter because I aim well.  Any non BB4 that comes at you = 1 shot death.  If a BB4+ comes at you do your best, but max 3 shots till it dies.  I'll also point out that you can consistently land 40-50k salvos on armored targets using HE at max angle.  Shinano is a AWQV slayer.