Not sure what you mean by can’t be compared?
The x86 tablets are fast, often have open graphics drivers, are compatible with a wider range of software, and many of them have better input devices (presure sensititivity than comparable ARM devices). You have to be careful in selecting any device lest you get burned but they definitly are comparable.
I mean you are talking about devices in the $200-700 range… right the quality of tablet devices there varies pretty much irrespective of the CPU they have in them. The $200 devices are mostly media consumption devices and you start getting decent features around $400+ even on ARM devices like larger storage and better input. I’m not sure you really even loose out on battery life honestly… running the same software with similar screen size and brightness they’ll have similar runtime. The kicker is that the x86 tablets can run more software, software that is typically not mobile optimised so you can see shorter battery life if you choose to run that software.
I’m just saying that targeting a tablet if it is an ARM tablet essentially means targeting one device or a small group of them, not a platform, whereas all x86 tablets are effectively already supported PCs with tablet hardware attached to them.