The trouble with winter is that most cyclists have to go indoors to train. Not all of them, mind you. I have seen a few brave souls out there doing their training runs outside. Fanatics.
The recumbent has its own programs and you set the difficulty level and duration. Gets a bit boring. And although I have a TV in the room, I find the whole experience less than engaging.
Spinning, however, is a very different experience if you happen to have some Spinervals DVDs. Spinervals offers dozens of competitive and fitness DVDs. Challenging and engaging. I come off the bike having worked just as hard as I would have worked on an outdoor ride.
The feeling is also great. Nothing like the rush of endorphins to ease mental stress.