We did Lollipops on our boys birthday last week. He loved it, there was so much more there for him to play with. From memory it was the same price.
There is an awesome area for the lilttle ones, even a roller coaster

we were lucky it was empty when we were there and he went mad on it!
ooo and the ball pit, he lost all consiousness and literally dived into it....if only I remembered the camera
They had an area with cars in it too, which Chipmunks doesn't have.
Diffently worth a try in this crap weather!