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.

Things I want in a 2FA app:

1. Can scan QR codes
2. Categories
3. Hide all numbers except the one I tap on
4. Countdown indication
5. Import/Export

andOTP and Aegis both do all of this.