Handheld PC reviews only cover Asus and Lenovo.

Looking at buying a handheld PC, and none of the review sites cover OEMs like ayaneo or onexplayer in their head-to-hear breakdowns, so I can't get an idea how those ones compare to the major OEMs.
\ It's frustrating because those small OEMs are the only ones that support eGPUs
\ But it's only mildly frustrating because honestly I know my usecase is a bit of an edge case.