We've got a rental condo, and I'd prefer to sell ... DW and I disagree on this one, but not because it is a condo.
In my experience, the more decisions I leave in the hands of others, the more problems we have ... I don't care for condos, and I also suspect that as the housing downturn develops a little steam, we'll see what we've seen before ... condos will take the brunt of any hit.
One challenge with a condo is that if you personally want to be frugal, you can't affect the HOA fees for all practical purposes ... you'll be in a tussle with a large number of people who probably don't have your good judgment, may make asinine decisions re: maintenance, and you're along for the ride.
If you decide solar would be a wise investment to cut your energy consumption, no luck. Don't like the color of your condo? Tough. Noisy neighbor, just like an apartment? Best of luck.
But I think this is more of an emotional, philosophical choice than a clear, objective decision based upon analysis. Just my bias.