Today I finally did some real cantering - I had my horse going all the way around the arena and wasn't holding on! As a beginner, I think getting the hang of the trot is easier, simply because the rising motion comes naturally and requires less flexibility and stability in the body - at least to be able to do it without falling off. Cantering I'm still getting a bit bumpy, and I'm still at the stage where I'm leaning back so I don't fall off!
It does feel really nice, though, when you go from sitting trot into a lovely canter. The horse I'm riding has a beautifully smooth canter - he's absolutely amazing, and worth his weight in gold. That's saying a lot, as he's a pretty big horse xD
In conclusion ... I don't know which I like more yet, but right now the canter is harder!
If you believe everything you read, better not read.