I've experienced all three of the aircraft mentioned, for a training platform the BE76, without a doubt, the seneca is more complex with the turbos, however not enough to cause you any concern, the problem with the PA34 is landing the damn thing!! also I dont think its as responsive as the BE76.
Visit the reputable schools they will let you sit in the back if you ask and look for yourself
Hey JB only the BE76? I think that '340 is much more of a handful
