if you already have an exersaucer go for the other one. We have a jumperoo and it's pretty big - our guy loves it and is in it every day. We also have a door jumper thing - it's great to throw in the car and take with us when we go visiting folks.
I have and exersaucer, I also have the Rainforest Jumparoo. My daughter loves loves loves this. The seat turn like and exersaucer would and whats so neat about it is that when it plays music and your child jumps around in it in the bacground animal noises are made such as monkey, lion, etc.