Pocket is fpga though so your paying for the better accuracy. Personally not for me as the device is pretty limiting and I don't like analogues business model and general lack of core development.
Have a mister though and would always recommend that for at home playing, a portable mister would be amazing though.
As a new Pocket owner I would say the screen + FPGA is worth the extra if it covers the systems you want to play - obv it cannot compete with the Odin 2 etc for the more modern machines but thats not of interest to me personally, it basically is a portable MiSTer for 8-16bit home and handheld stuff with some incredible arcade cores too.
As a cart playing device its stunning, there isnt a portable machine going that plays Gameboy / Color / Advance stuff as well and I include the various modded OG machines - the screens used on those are frankly disappointing in comparison.
Its not prefect, the form factor is perfect for GB / GBC but not for others but I've still been playing Snes / Megadrive games etc with my jaw on the floor - its like a handheld Super NT and levels above any other emulator machine ive used - mostly due to the screen, I’m not bashing emulation as such as they all do a great job in the main these days but the screen - wow!