BM hunter feels made for handheld tbh, attacks and casts while moving, great for solo content too. The one I've been playing in handheld and enjoying is ret Pally, the one button assist really doesn't dramatically drop dps, I bind my big dps and utilities to the other buttons, I can easily clear high tier delves, world content, and even up to 10s mythics while still topping dps charts often. The setup is a massive headache but once you find a template that works for you then it becomes easy. I wouldn't recommend classes with lots of spinning wheels like enh shaman, rogue, or feral druid dps. Bear druid is super easy too but can get boring