The gecko is a lot smaller i think, it doesnt have a height adjustable handle and dont think you can change the covers.
Ive got a cameleon and would recommend it, best pram ive ever had! and ive had a few!
They dont fold small tho, you have to take the seat of then hold the frame up so folds in 2 parts, weve got a people carrier with a huge boot and it takes a lot of the boot space up. You can make it smaller by taking the wheels of but cant be bothered doing that everytime we go out.