I've got a SRAM MTH-506 R(ear) hub which started to grind on my last ride. When I got back I noticed play on one side of the hub i.e. the drive side. Taking hubs apart is not one of my favourite tasks as I'm visualizing bearings escaping left, right and centre. Anyway this didn't happen but upon disassembly I noticed the drive side bearing grease was pretty cruddy whereas the other side was clean as a whistle. The drive side cone is done for and the cup doesn't look great but I'm pretty sure I can clean it up (though I'll probably replace the whole core). Now I can get a core (the bit that the cassette mounts onto and includes the bearing cup) but where my knowledge runs out is where do I get replacement ball bearings (and possibly cup if the very clean non-drive side is also a bit worn), ball bearings tbh are the priority right now. I've looked up SRAM service docs online and nothing tells me what I should be looking for. I'm also aware I'm going to have to get the Freehub Body Removal tool (11mm).
I'll soon be replacing these wheels and wanted to ask would I be better off getting hubs with cartridge bearings rather than the traditional cone & bearing setup. I imagine cartridge offers a lot of advantages.
Last question, I have a 1x12 speed setup so with my new wheels I'll be sticking with this. Which of the following gives me the best options Shimano freehub, XD drive or Microspline?