the radiolink minipix runs non-branded default ardupilot fw without issues. you can use any mavlink compatible GCS for setup / handling as well, including non-branded default MissionPlanner.
the radiolink minipix hardware is a budget F4 board with a basic sensor- and hardware lineup. the set comes with a M8N-type GPS / mag combo and a PDB-type power module / curr sens.
the holybro pixhawk4 mini is based on fmuv5 design standard with quite a lot more hardware features like F765 mcu, dual sensors, IOMCU, CAN support etc.
imho it‘s a matter of personal preferences if you want those additional features on a hobby-type setup for recreational fixed wing FPV.
in case you‘re rather looking for a budget ardupilot FC that suits hobby-type FPV applications, you might want to look at aio-type boards like omnibusf4pro or matekf405-wing too. they offer an onboard OSD chipset and onboard current sensor. they basically just need a GPS, a cam and a transmitter added to get flying.