First off, you’ve got options. I’ve had both Rudy Project (Radon) and Oakley (Half Jacket 2.0 XL lenses) for the past year. Both have interchangeable lenses which can be purchased with photochromic lenses (i.e. transition to darker with brighter light). NB: If you buy photochromic lenses you don’t even need to swap out lenses. Not only do they do a great job on the trail but I’ve used both sets for night riding and I’ve been blown away at how well I can see. I’ve been extremely pleased with both but I give the nod to Oakley’s. They are more comfortable, sturdier and better looking. Although it’s not a key factor you can also swap out the frame socks with a different color. Timing is perfect right now for buyers with Black Friday sales coming up. SportRx is pretty expensive and their sales pale in comparison to other sites. I bought my Oakley lenses at adseyewear.com.
I have to say that of all the purchases I’ve made (bikes, tires, wheels, dropper, etc, etc) these certainly rank among the best. Obviously, they’re also not limited to MTB’ing as I use them for driving, running, watching shows, or whenever you need.