I'll take Scotland Run over Unionvale as a course but all things considered would say I am more likely to play the latter. The former has its faults--the routing gets painted into a bit of a corner on the back nine--but it has some fun shots and a decent mix of holes overall. Sort of falls in that category of courses that are the equivalent of a good "Wednesday night wine", though with a three-figure green fee I don't love SR on value.
As for Unionvale, as Matt says, it's about an hour and a half from Manhattan, but it feels like longer--it's officially in the boonies. It's got an unusual farm/faux-links atmosphere that actually works better than it probably should. The dominant feature of the course is a broad wetland that pretty much bisects the entire property, and my big problem with UV is that I really dislike the way it was used. I don't know what existed in the way of natural features here before the course, and I won't pretend that I could out-route Stephen Kay here--but the wetland is used in a pretty aggressive fashion. You have to cross it on four holes--twice heading one way, twice the other--and in three instances it's really only used to take the driver out of the average guy's hands. I don't mind that per se, but for me it's pretty one-dimensional, and it gets worse as the golfer's power diminishes. My wife, who can definitely hit the ball a little bit, won't play UV.
Matt, I know you're a long hitter--do you have the option of driving it over the wetland on #1? I could see that being a fun thing to try.
Those four stick out in my memory, but there is some good golf out there. The place still feels pretty ad hoc, with experiments with different bunker styles on some holes that sometimes work and sometimes don't. Mix of some relatively easy holes and some bears. The nice thing about UV is that it's a very good value ($40ish?) and pace of play has always been good, in my experience.