Folding
Cameleon does not fold with the seat on either way. Not sure about the icandy.
Pushing
Bugaboo is lovely to push either way, even with a large heavy toddler in it, can still be steered and go up and down kerbs with one hand. Havent tried an apple, but have used a pear with single seat and found it horrible to push after the bug, and very very heavy.
Carrycot
Hardbodied for icandy, takes up loads of room to store. Doesnt say if its safe for overnight. 84cm long.
Bugaboo - Soft body with rigid base, and can be used for overnight as it has the aerosleep mattress. 90cm long
Weight
Icandy - 12.9kg with the seat on, 15.7kg with carrycot.
Bugaboo, 9.28 with seat, About the same with carrycot.
Seat
Bugaboo - 3 position recline forward and rear. seat 90cm long.
3 position forward and rear, 89cm long.
Both have a 2 year warranty, personally I feel bugaboo is a lot better made, and the covers etc are a lot easier to get off and wash. Also, the hood on the bugaboo comes off totally, which is a big plus as you can replace if it looks worn and get a brand new looking pushchair. Both brands hold their value really well.