Signal doesn't have a proper backup/migration mechanism yet when adding new devices.... Whatsapp is more complete. Idk, maybe Element too but haven't used it recently
>Not to mention the app is a buggy mess. At least on iphone.
If you think it's buggy on iPhone you have no idea what's going on on Android. The iOS venison is actaully the "polished " one as Signal devs daily drive iPhones.
In 2019, the official Telegram client didn't have chat folders so I was using a Telegram client made by an Iranian dude (Telegram was extremely popular in Iran and Iranian clients were the most feature-rich).