Where to go?

[Niwashi]

Duty Finder is cross-server and will draw people from all worlds in your Data Center, so being on a smaller server shouldn't hurt your DF queue times. I believe Jenova is on the Aether Data Center, so would share the same player pool with Adamantoise, Balmung, Cactuar, Coeurl, Faerie, Gilgamesh, Goblin, Mateus, Midgardsormr, Sargatanas, Siren, and Zalera. At North American peak hours, the DF queue there isn't bad (though it might be during off-peak hours).

Note: next week the DF queue for DPS classes is likely to get worse than ever while lots of players try out the new Rogue/Ninja class/job that are being released. It should be a great time for leveling a tank, though.