Thinks of the Super Nintendo immediately. Liked several games on there whose series no longer hold nearly as much interest (mostly platformers). Could be an age thing and shifting tastes. Shrugs. Cannot feed the deeper RPG hunger on that system, though. (Enjoys Earthbound and Chrono Trigger, sure. Describes them as pretty straightforward on the grounds of customization.)
Likes several other Nintendo system a lot too (DS, 3DS, Gamecube, and Switch). Finds it difficult to rank them.
Edit: Leaves an honorable mention to the Gameboy Advance SP. Added a good backlight, built-in battery, and clamshell design. Crushed it on design.