"I owned a few handheld devices in the past (PS Vita, Switch OLED,...)
But the Steam Deck OLED is the best one I have.

It is not as powerful as other devices such as Rog Ally X, Legion Go,... but it runs SteamOS instead of Windows, this alone makes the experience soo smooth. For AAA games, I can just use Remote Play over Wifi 6 and it's super smooth."