Mavic 819 rims on hubs of your choice for defo. Not saying Mavic wheelsets aren’t nice, just damage one on holiday and that’s it, game over!
819’s are also very very tough rims for their weight/width. Hope Pro 2 hubs aren’t bad, as PK Ripper says I believe the BULB was a better hub too, but you can certainly do a lot worse than the Pro 2’s, and they are multi axle compatible which is always a bonus should you change fork/frame and want to keep the same wheels.
Get em built by a good wheelbuilder, and use DT comp spokes with brass nipples (14mm at least, probably 16mm) and they’ll stand up to plenty of abuse, yet be light enough for day long XC rides.
823’s are very good too, but a bit too heavy for anything but a proper DH bike IMO, very strong again but you do notice the extra 150g or so per rim if you’re not heading downhill the whole time.