Wii Sports 
Boom Blox Overall Comparison It seems silly that the free "game" that came with the system would be better than a game that you buy, but it is. Wii Sports has many different games to play and because of how simple they are all, almost anyone can play it. With Wii Sports, you can hand your grandmother the controller and she will be bowling in no time. Or playing golf.
Boom Blox is still fun, but there is a learning curve, especially to those who never play video games. Pulling out blocks can take some getting used to because of how awkward it can be to pull a block out at a specific angle in 3D space using only left, right, up and down movements with your hand cursor.
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Comments
Wii Sports was altogether less exciting to play, but I feel like it has more staying power. I'll probably be playing it much longer than Boom Blox because it has a good variety of games whereas Boom Blox is a bit too limited to one play style.
However, I feel like the learning curve on Boom Blox satisfies my need for a good challenging game. Since I find the games pretty much equal in my mind, I'm mainly disagreeing in order to represent challenge-hungry gamers.