I need your help! DH and I are pretty set on getting one of these for DS's first birthday next month, but I cannot decide between the two brands or find a definitive list of differences among them...they basically seem the same to me. We are looking between the Smart Trike Zoo or Sport (anyone know the real difference in these besides color/pattern?) and the Little Tikes Discovery Sounds.

I do like the look of the Smart Trike better and we LOVE that it has rubberized wheels and a full metal frame. It also appears to be more roomy in the seat area which I heard was a problem with the Little Tikes brand. However, the weight limit on Smart Trikes is 38 lbs and Little Tikes is 50 lbs. DS is already ~23 lbs so the smaller weight limit concerns me (he is slowing down and actually lost an oz from 9-10 months).

If you have either of these why did you choose that one and what do you love/hate about it?