If you want to keep your history in Signal, you’ll need to backup your messages in a file, and restore your history on the new phone with the file (at least, it’s the easiest way I could find).

I prefer the account-based philosophy of Matrix over the phone-number one of Signal, but you mileage may vary.

Matrix (and Element, its mainly used client) is not without flaw of course, notably voice/video call works somewhat better in Signal in my experience.

One advantage of Matrix/Element over Signal is that it isn’t linked to your phone number… Much easier to use across platforms and when you change phones.