Hi Amy!
We went to both waterparks last year and here are my thoughts.....
Blizzard Beach
**Loved that we could all ride Teamboat Springs together.
**The "lazy river" is awesome and we spent a lot of time there...also an attraction the whole family can enjoy together
**Very well marked and easy to navigate.
**The walk up the "mountain" is treacherous...the ski lift is nice, but it had a line ALL the time
**The kids' play area is great....both of my older boys enjoyed it
**Wave pool is tamer than TL and easier to enjoy if anyone is a bit timid of the giant waves
**The toboggan races were so fun...although you can't ride them together, you can ride side by side.
Typhoon Lagoon
**Crush n Gusher is the best waterpark ride I've ever been on!
**Snorkeling at Shark Reef was awesome! Even Jonah, at 8, was able to enjoy it.
**Not as well marked and harder to get around than BB
**The wave pool is scary...I'm not a fan of the wave pool as it is and the surf pool was just too much for me.
**Sand....I don't enjoy sand and there is a lot of it at TL
Overall, I enjoyed BB more than TL, Although the shark reef and Crush n Gusher were family favorites. I agree with Julie that you will find more for varied age groups at BB...Summit Plummet for the daring, the toboggan races and double dipper for the semi-adventurous, and the kid's area for the little ones.
I wish I could be of more help. I look forward to hearing your decision!