I've done both in an exam situation and I have to say, C1 this year was much less fiddly, there were less surds and the questions generally weren't trying to trip you up. Like imagine doing last years C1 exam in the middle of your exams with all other exam stress and then trying to come out with a cohesive answer during some of long, drawn-out questions, then compare it to this years area question and hm.
I think they realised their mess up last year when they kept putting that 'solutions based entirely on numerical or graphical methods are not acceptable' leading to many people losing marks due to not being sure what that means for things based in trig (I think that was C2 though correct me if I am wrong)