Actually there is still a reason why you should use one. Because after that 3 hit combo, you can use a KM/Special Arts right after by canceling the combo into one. So even if you don't have a multi hit killer move, it still adds a four hit to the combo and extra damage.
still a bad system/a change that was not needed, esp for any die hard fan of the original, also kills nostalgia it just feels wrong entirely and wasn't a fan of that dum change on the so1 remake either.
still get more benefit later on chaining km moves into one another, so again its pointless and just irks me its even in there.
which is why I still play the psx one given the choice, still prefer that version without all the other changes.
Anyways to the TC,
depends on what type of gameplay/style you want for your run through the game, also depends if you're doing any ''challenges''(restrictions put on yourself)
Claude Great in all modes
Ashton Good-Great (range and animation delay can be an issue sometimes, hence the split rating)
Dias Avg-Good, "Bad" in universe mode (low hit skills, can't star spray)
Opera Avg-Good, "Great" in universe mode (she's overkill for normal mode and wont put the time in creating her 3 KMs, but her range and utility is amazing for universe mode)
Precis Good in all modes
Chisato Good-Great with a certain weapon
Bowman Great in all modes (just spam poison/explosion pills)
Rena Great, benefits any team, can be swapped out for Opera though (depending)
Celine Kind of useless, buffs don't matter much
Leon The best mage, only one with multi hit spell, but it does terrible damage unless you do that weird spell combining thing.
Welch *cough* Useless
Teams I've ran:
picked up Rena - Dias - Ashton - Precis - Celine - Noel - Claude
used mainly Rena + Claude + Dias + Ashton for fun, Precis
picked up Claude - Opera - Bowman - Leon - Ernest - Chisato - Celine - Rena
used mainly Claude + Opera + Bowman + Chisato for fun, Leon/Ernest