I prefer the classic top panel. I like it because it is rock solid, unlike some other options (looking at you, Brisk Menu). Everything is clear and readily viewable (aging eyes). First thing I do with an Ubuntu MATE install is set it to classic. It's what I like about MATE.
I don't usually use the bottom panel - I use the Plank dock instead. I use a desktop with a proper 4:3 display, not a wonky laptop 16:9 letterbox aspect ratio (designed for watching movies), so I don't put any panel/dock on the left.