Just to put it out there, with the exception of the Steam Deck, many newer handhelds use the AMD Z1 chip, which is a variant of the 780m mobile GPU, which itself is only a smallll performance bump over the 680m, which came out january 4th 2022.
AMD's next generation integrated GPU, the 890m is literally around the corner, coming in the next few days. Early looks at the 890m seem to show about a 35% ish performance improvement over the 780m.
TL;DR - Get whatever you want, but friendly warning - expect a new wave of handhelds within the next 6-8 months that will drastically outperform whatever you can buy today. Even a successor to the steam deck will be here before you know it. Professional recommendation: If you haven't gotten anything yet, either get something really inexpensive like maybe a second hand steam deck or just wait for the next generation. Unless money is no issue for you I suppose.