I haven't used one in years now but when I did I liked the regular thick rubbery ones best even though they were the least durable. The thin plastic ones were rarely better than bare wood and all of the fancy wrist support ergonomic ones look either fraudulent, specific to conditions I don't have, or just plainly annoying.
But all I use at home these days is a tablecloth on my desk. A cloth one, not a plastic one. It does the trick and let's me keep the clutter down. Last time I had a real mouse pad was the last ball mouse I had.