Interesting thread.
I would go for the command on the baby bus and then in a year or so go for the corporate job because at least in years to come should there be a slowing down in the industry then you are head of the next guy who didn't have command on that type.
I'm just about to enter the world of corporate jet work and leaving behind what I consider the high pressure go go go environment of turbo prop airline work. I know its not going to be easier but will present a diffferent set of problems to solve and I'm looking forward to it.
RP