Well the *Prime* version would be the most logical choice since that series aired around the same time MLP: FiM did, but do keep in mind that it is still *Parallel Universal*, and though it does have the same Autobot team from TP, it is still it's own reality with it's own unique canon to make it more compatible with MLP: FiM lore, so to be honest it can be which ever "Prime" the readers would like it to be.