Well why not play them all?

But practically speaking, play MNK. MNK and SAM share gear and if you arent a cutting edge raider, you can scrape by without BIS and proper melding. MNK will just take longer to level, as it doesn't start at 50 (but not too much longer, honestly leveling jobs is easy. You should be able to easily hit 70 in 2-3 days of focused effort) and it's currently more preferred.

Quote Originally Posted by Risvertasashi View Post
Well, that depends a lot on your preferences.

First and easiest distinction to make, I think, would be do you prefer to stand at range or be up close? Do you mind having very restricted mobility? BLM is essentially a turret mode caster and movement can have very sharp DPS penalties if you don't manage it well/don't know the fight in already. On the flipside, it can put out some really ridiculous burst damage.

On another note, though, FFXIV's job system means you can play them all, what you're really deciding is what you want to play first.
Yeah but weekly lockouts make it so you're going to want to have alts anyway...