The Defender Version aesthetic in general is preferable to me. Something about shrinking them down makes the stylization/art style change work better. And the faces are definitely preferable to the regular size ones, which tend to look oddly long or big for the helmets.
I've idly gotten a couple of Defender Version ones, and I quite like them. Really my main complaint is I wish they'd stop making vehicle mode ones, if they HAVE to be true blind boxes anyway. Or at least make those a separate series/wave. It gets the "let's sell them the same guy twice" without the annoyance of randomly getting a static truck or jet when you were open to literally any robot mode dude you could pose with the others.