Still use Google Authenticator. I know there are alternatives out there that have other features but I'm a pretty strong believer that my 2FA shouldn't be backed up digitally. I keep any recovery information offline and prefer it that way.
These apps are all pretty basic. I don't see any major differences. It's slightly more modern looking, and it checks a lot of boxes for people as far as being simple, open source, and available through multiple channels (Google Play being one). Apparently andOTP hasn't had any updates in a while, but a 2FA app shouldn't need many updates anyway.