u/InternationalYak3220

I recently just sold my gaming pc due to constantly moving from my house to my girlfriends and am struggling to play on it. I want a handheld but not sure what to get I've been doing research and looking into what the best and have decided i want either the Xbox ally x, Lenovo legion go 2 or Lenovo legion go s. I want one that can run windows and steam os well and i want to be able to run in on a monitor and with a controller/ mouse and keyboard and want to be able to upgrade it later on the line to better its performance what do you guys think and can give me some advice please and thank you.