I would consider support in addition to performance and space so long as the smaller plane will fit what you need to move.

Easy and convenient access to a shop that specializes in the type would increase the likelihood of a happy experience.

I don't know this to be the case, but it seems reasonable that parts support for the Piper would be better given that a similar airframe is still in production and that Cessna would probably prefer that all the legacy twins be mulched into beer cans.
-dan

For 4 people it’s tough to beat Malibu. As stated, hangar requirement can be an issue though.

I flew colleagues around in it a lot. Never had anyone not love it. From Denver you could beat airlines door to door to most spots.

Ride is better than advertised in this thread. I think people see the big wing and think it will be bad. It’s not any worse than other 4K lb GA planes IMHO.

Great owner community exists at MMOPA.

If I ever couldn’t justify MU2 I would immediately trade back into a Malibu and be happy as a clam.

FIFY

Just a note on wingspan vs. hangar size; Malibu wingspan 43', C421 41' 10".
So, yes, the Malibu has a long wing, but either one may not fit in a run-of-the-mill t-hangar.

The tail height is usually the limiting factor on the 421C IME