Beeper is based on Matrix and the bridges they use are almost all open source. It's an amazing Matrix client (including on Android and, reportedly, iOS) and that makes it pretty great at everything else. Though the Discord integration could use a bit of work still.
Texts looks entirely proprietary and the FAQ says they're working on an iOS app.
Mobile app is the big one. iMessage too. Texts iMessage solution is wanting. It requires leaving messages open on the computer you have it installed on. Might be Mac only.
Texts was too buggy for me to keep using. I still think it has potential though.
What is it that you are looking for with this comment? If you already know texts.com is there a degree of comparison you cannot glean from reading beeper.com?
Texts looks entirely proprietary and the FAQ says they're working on an iOS app.