If you can manage it, the college route would be best, becauseyou'd be registering with others at approximately your own level.Other classes for adult beginners are nearly always "drop-in"classes, & this means you'll be surrounded by dancers with muchmore experience than you have, even though they're still nominally"beginners." That can be terribly discouraging, & the temptationto give it up as a mistake can be great. Harder to do if you'veregistered & paid a term's tuition.
Hope this helps.
Tom Parsons