All Rainbows exhibit pretty similar behavior. They are all active and peaceful. I can't think of a reason that would make one better than others for a community tank.
The big difference is color.
Here are some from my tank. I like mixing them so that the colors are like a "rainbow" moving around the tank.
Boesemani Rainbow (Melanotaenia Boesemani)
Running Creek Banded Rainbow (Melanotaenia trifasciata)
Tami River, Millenium Rainbow
Blue Rainbow, Lake Kutubu (Melanotaenia Lacustris)
Goyder River Banded Rainbow (Melanotaenia trifasciata)
My tank