Well on PC, I would definitely recommend KeePassXC - it has a more modern UI and some nicer features, but standard KeePass is also fine. On Android, I personally prefer KeePassDX - I think it’s a bit more polished and less buggy than KeePass2Android.

To sync my database between my PC and phone, I use Syncthing, which is a fantastic free and open-source software. It allows you to sync files between your devices, without using any third party servers. Also, everything is end-to-end encrypted, so it’s probably one of the most secure ways to transfer data between devices.