However, the xpra client is somewhat strange and inconsistent when it comes to CLI/UI behaviour.
Video streams can be a real issue if you're working over a slow connection, especially when your application is using small text. RDP will handle remote GUIs much better, as low bitrates tend to make text unreadable.
Of course RDP also supports streaming individual applications.
Personally, I think RDP is undefeated at what it was designed for: controlling desktop GUI applications. On Linux, that's not the case, though, and xpra will provide a very good alternative.
However, I find very few good xpra clients outside of Linux distros. For example, when I look for xpra in Google Play, the first three options are Microsoft's RDP client, two X11 servers, and RealVNC. F-Droid lists nothing at all. I suppose u could try the HTML5 client but it's kind of a bummer. The situation seems to be the exact inverse of RDP: very good Linux server, difficult to use Windows clients on all other platforms.