I switched to Authy some years ago. It took Google forever to add the ability to Authenticator to let you migrate 2FA codes to new devices, and even then, it was only Google codes. I got tired of having to deactivate 2FA on my 20 or so accounts, switch to my new Android device, reactivate 2FA, and then scan the QR codes on the new device. Authy made it a painless experience, particularly since I could verify codes were working on the new device before factory resetting the old one.
I use Authy, but God, I hate their UI and UX. Finding the accounts there is a pain in the ass, and for some reason, I always end up with duplicated accounts (when I just added them once). Also, it has been two months since their last iOS update, so it's not like Twilio is taking care of it either.