I'm happy with my Vita and I'd rather have a handheld than be anchored to my couch. I like being able to pick up the Vita and play for a few minutes, turn it off and grab it again in a couple hours with no hassle. I don't leave the house with my Vita very often either, but I like that I can play in my office, or on the couch with my spouse watching a TV show etc.

One downside to the Vita is that it was painful for me to play for more than a couple of hours at a time until I got good a grip for it. Not an issue once I bought a grip, but being able to use a proper controller is a definite benefit of PS TV.