I believe the cushioned vinyl might be more comfortable for you under foot, but you can get a cushioned underlayment installed under plank style floors, also, and that might make them more comfortable and also quieter. Whatever you get, a chair that's used a lot, whether it rolls or just scoots, tends to be hard on flooring. You can buy an office chair mat that is designed to go on a smooth floor, and that's what I'd do to protect it.