Franklyn vs Continental vs Lycoming: which is better?

Gee, how's that for an incendiary topic? grin

In my ongoing quest for a plane, I've narrowed down the types I'm
looking at. Currently it's down to Stinson, Pacer/Tripacer, Cessna
170, 172, 177, and 180, Maule M4, Musketteer, and Bellanca Cruiseair.
Naturally I need to reduce this list a bit more! Availability will do
that some, but I'm looking at engines right now.

A number of them like the Stinson, Bellanca, etc have Franklin
engines. Others engine types are Cont C-145, Cont O-300, Cont O-470,
Lyc O-290, Lyc O-360, and Lyc O-435. Yup, some are old types, that's
my concern.

Have you had or heard of experiences maintaining some of these older
engine types? I've heard, for example, that the Franklins are hard to
find parts for and that this raises overhaul costs. Also, I'd
appreciate comments on the other engines as well. I've also been told
that Beech parts are priced with respect to the original sale cost so
that maintenance the Musketteer is more expensive.

Comments and info much appreciated!

Thanks,
-Malcolm Teas