I love this ride. I think it is so fun. It's more fun for me during the day, rather than night, which is usually the other way around. I prefer Splash Mountain at night. But the Matterhorn is awesome. Both sides of the ride are cool. I think I like the Fantasyland side a little better though. And it's one of the classics, which makes it that much better.
We always ride both day and night, and usually end up on the TLand side in the day because the line is shorter. After they merge the lines at night we usually choose the FLand side.