I am running 5FTS/3TBs right now on my PCV and it is not ideal. More often then not, I don't even launch TBs. I would prefer to have 6 fighters. By carrying a lot of fighter planes and leaving them over the enemy BB line until they crash, I can keep constant vision over their line without running out of planes. You need a lot of planespace to do this.
I would like to have a TB whore midway crew, but I am not good enough with them to make my teammates suffer like that every game, so I am going to do the PCV grind twice.
2 AA gunnners
2 TBs (R slots)
At the end of the day, I will have 8 TBs, 8 Fighters 1 Seaman, and 2 Pom Pom gunners, plus anyone I want to borrow from my QV crew.
I highly reccomend using arm sailors on your PCV. Mine are at lvl 119 now and I still haven't classed them. With 255 bulge, an escort with sonar and PHHs I can't envision a scenario where a sub could kill me.
Not everyone is up for this much leveling, but it is nice to be able to run different setups. Right now there are very few players good enough with TBs to justify using them over fighters. You can never have enough fighters and if you find that you would rather have TBs, there are plenty of people who make that trade with you. To answer your question, when in doubt chose fighters over TBs.