I wouldn't say solo though. TYM is just more of a resource for regional match making and a good outlet for finding casuals in your area! This game is 1000x better offline, I can assure you, it's more fun too! Online makes me a salty mofo. Baby me offline and I ain't even mad.
TYM hands down. MKU hurts to look at, looks clustered, doesn't look easy to read. TYM has a nice community too, from what I've heard MKU has a lot of "cocky" people.