[lurkingknight]

ares has a proprietary triggerboard/switch/mosfet/firecontroller. They embed a magnet into the sector gear in order for the sensors and software to function, if your gears break, you have to transfer the magnet to the new gears which means you have to extract it out of the gear. If the board breaks, you have to replace it with an equally shitty triggerboard. The higher end of the upgrade spectrum might be more difficult to achieve reliably with an ares because of those proprietary parts.

With a basic v2 gearbox with no frills, anything will work, basic mosfets, high end trigger board mosfets, any set of gears, any combination of parts. Some makers have better compatibility than others. It just so happens vfc is very consistent from one batch to the next so issues that come up are very predictable and you can put almost any part into them and they will work without having to dremel or transfer parts.