Should I Grind Dungeons from 45-50?

[Alkimi]

Might be worth it to practice and learn your rotations before you hit lv50, Dragoons are notorious for being spectacularly terrible and you don't want to be in that (large) club.

[Mykll]

Anything where everyone pulls all the mobs and you just spam one or two aoe skills/spells. BAD.

That said, you should do what you enjoy. Do you enjoy chacing the red Fate dot on the map around like a cat chases a laser pointer? Do Fates. Do you enjoy dungeon crawling with a party, fight some trash, some bosses, maybe get some loot for potential upgrades? Do dungeons. Sitting at 100 Leve Allowances? Do a few of those so that you are constantly earning them instead of always sitting at cap. If you decide on dungeons you will level your tank faster. Just the nature of MMO queues.

I laugh at DD first room. I mean, there are only 2 dogs in the first room, how great can that exp be?