You can get the same attack from rage from NLC attack pots, so that is out.
Lvl 1 booster gives the same speed as lvl 20 booster, so as long as it is at a decent lvl, that's fine.
When maxed, Final Attack gives a decent boost, but until it is maxed, it actually hurts you (especially when doing Slash Blast).
When comparing those three, a combination of Maxed Final Attack and Booster make for the highest DPS. Mastery of course, gives the biggest boost.