Suspension and amplitude can be a double edged sword with the canter - some of those canters that really climb up and out can be really hard to stay with (rider must have a very soft, following seat/hip/back). On the other hand, finding the right degree of naturally uphill can create a canter that really just sits a rider back in the saddle and swings you along.
On the other hand, one of the most comfortable canters I’ve ever ridden (although far from the most correct, from a dressage perspective) was when my first horse was doing a stretchy canter. Working over his back, long and low (think “hunter frame” - nose poked out, really stretching down and out) and moving somewhat flat because he was a bit heavy in the shoulder and not so active with his legs behind. It was absurdly comfortable.
Ultimately, I think part of this is going to be rider dependent - what physical challenges each rider has will dictate what they find comfortable or easy.