Try grip tape first to see if you really like the extra traction. If you end up replacing the grip tape because you like it, then it's time to go ahead and make it permanent and go ahead and stipple it. I've done my Glock 17 and 19. I did the 17 first. I would recommend leaving the highest parts of teh backstrap free of stippleing, to prevent clothing from sticking if you carry concealed. A shirt can kind of grab on a bit and not slide over the pistol grip as freely, which can cause more printing issues.
Down here with the humidity, the stippling was the way to go though,because sweaty polymer can get slick. If you go with light short touches you get a shallower stipple that is more like grip tape, and you can go with heavier presses and longer contact to get more agressive stippling like what is on the front strap. I also chopped the grip a bit shorter on this 17 so it will take G19 mags.