The Aerodrome and Approach courses are certainly shorter than Area, but I think it's hard to say which is easier. Area requires verbatim learning of a fair about of material, and Aero doesn't - whether that makes it easier is up to you.
The Aero course probably does usually seem to have a higher pass rate although not for all recent courses - and remember, it's not all about passing at the college as you still need to validate at your unit. I have no idea about pass rates between Area and Aero units.
Don't pick one course over another because it might be easier - it's hard whatever route you take. Instead, pick the one you most want to do - that enjoyment should hopefully get you through.