The new AllyX is really good apparently but I can't imagine using one of these windows handhelds without the trackpads cause there's a lot of times you need to use Windows for tinkering with stuff and using a joystick in windows or the tiny touchscreen is really clunky, unless you plan on using it docked most the time.
There's also a bunch of new ones coming out lately, MSI and Lenovo are also about to release new iterations of their handhelds as well (and have shown some improvements on their previous ones) and they're all in a similar price range.
Even if it's not as powerful as the rest Steamdeck is still king to me.