Go with Mei Feng! (I'm not all biased, nossir)
She is a lot of fun, her abilities have been pruned away to upgrades so if you want a straight up game she is good but can be expanded with her upgrades over time and experience. The rail Golem is an Arcanist construct but with FOUNDRY she can pull it from Arcanists into 10T or can pull the Rail Workers and Kang from 10T if you want to run her as Arcanists. (FOUNDRY limits the number of models out of faction to 4)
I have been playing Mei as 10T with Thunder Archers recently and really like her as she has been updated slightly with M2E.
Hope it helps. Any questions, just ask.
D.