22mm has better spacing on the layers for my fingers. if your fingers are fatter though perhaps 25mm.
as for thickness it all depends on your hand and handle. if you could use a bit of extra diameter go for the thicker and vice versa.
If you're interest is to increase handle-weight for head-lighting the racket, then get 22mm and 1.5mm.
If you use an overgrip perhaps 1.3mm is better though.