With armory bonus should only take you a couple days to hit 50. Upon hitting 50 you can go to the market area in Ishgard and buy, from vendors, ilevel 115 gear for every slot. Which isn't quite i120, but well enough to advance and do dungeons. Should get past i120 pretty quickly at that point.

So catch up is just. . . 20 levels at +100% exp.

So not really worth consideration, in my opinion. Do what you want, see which you like better. Warrior has gotten some great buffs from what I understand (haven't leveled my own yet, doing monk first, and tomorrow is my first day off to spend alone with HW--but the internet seems to think they're, if anything, TOO good now).