For the MSQ, I'd recommend DPS. Tanks and healers will always have fast queues but DPS tend not to. So dump all that free EXP on them and grind out tanks afterwards is my advice.
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You get more than enough xp to lvl up more than one job at the same time. You can easily pick 2 jobs, even 3 from the beginning. If not, with arcanist you get both a healer and a dps with scholar and summoner once you reach lvl 30 and they level up together. If the dps queues are too long, you can swap to healer. You can pick that and a tank role. Also, if you have xp to spare you can pick up extra jobs at lvl 50, 60 and 70 without any other requirement than the level.
I was excited until I saw the queue when I went to login on Seraph.
At least Dynamis is located in NA and people will be able to travel if the queues are too long.
Still, it is not ideal and that remains the reason I am chosing to stay on Excalibur/Primal and forego my chances at a bigger house: it is very active and save exception queues are rather short. I queued dps for some Eden raids to unlock them on a toon last week between 12 am and 2 am and I only waited <10 mins. Nier is easy to get too if it is not 2am.
Which of the dynamis worlds have the most players atm? Trying to decide which one to move my alt to, and i like a lively world!
Well another thing to keep in mind is that up to a certain level there's Duty Support so the only queues that will be an issue are anything that can't be done with that. And there are hunting logs, beast tribes, FATES, and GC daily hunts to supplement. I've got all 90s so I know a lot of leveling tricks and I'm not too worried about that aspect. I was mainly going to focus on tank as a role I don't normally do. I'm a WHM/BRD main.