Things I like about the Catskill 3500-
There are still cannisters on the trailless peaks.
Almost anything that looks like an interesting route on a map will work out as a good bushwack route. With a few exceptions, there is little blowdown and thick stuff like the ADKs Even the peaks with scratchy stuff don't come close to ADK bushwacks.
In the winter, unless there was a party just before you, the trailless peaks are really trailless peaks and you get to break out your own route.
Much of the woods are deciduous, making for lots of open woods.
You can bushwack the trailled peaks and mostly the route will "go".
I started out years ago scoffing at my friends for spending time in the Catskills, feeling they weren't really mountains. They are really a lot of fun and never as crowded as the Adirondacks (which I love also).
Invariable peakbagger that I am, I'm working the the Cats in 4 seasons, and started a monthly list not too far back in case someone wants to join us for company.
PB