I switched to carrying a small front pocket wallet (basically a business card holder) a while back. It lets me have some bills for the odd vendor (e.g. food cart) that doesn't want to take a card for a small purchase and a few other things like ID that I like to have on me. In general, like paper boarding passes when they're convenient to print out I just find it easier to use a physical artifact rather than fumbling with my phone or watch. But I'm happy to admit that may be largely habit. Certainly in circumstances where carrying anything in a pocket was inconvenient, I can see using a watch.