From my adjacent experience (ultrarunning / multi-day races), after trying a bunch of different brands, I've settled on Drymax. By far the best blister resistance! They're really good at keeping feet, well, dry, which helps a lot against chafing.

If you have particular hot spots, I'd also recommend applying some foot cream like Trail Toes. I always use it for runs over ~30km.

Merino wool socks are definitely what I'd recommend for trekking.