Wiha EgroStar are my go-to, almost more for the holders than the hex keys themselves. Wera Hex Plus are good, I used the stainless ones before I discovered Wiha. Bondhus BriteGuard series are also pretty nice, I have a set of stubby ball ends.
As others have mentioned, hex keys are go-to for many working in high tech industrial and machining environments. I use them constantly in my robotics job. Socket heads screws everywhere, often in locations that are hard to reach with limited clearance. They're often smaller sizes as well (M2 - M5) threaded into aluminum where the risk of cross threading and stripping is higher if you're just bearing down on it with a hex bit in a ratchet. Hex keys are much more appropriate for torque control when assembling precision equipment.
One set of specialty hex keys I've become fond of is the HBL900N from Mitoloy. It's a set where the short end of the key isn't actually short but about twice as long as normal, like a T-handle hex wrench without the plastic molding. Great for getting to those fasteners that are a bit deeper into an enclosure - you can reach it with the "short" side and still have the long end for applying plenty of torque, instead of reaching it with the ball end and using a cheater to get the needed force on the short end.
Shop Neo L-Shape Ball End Hollow Hex Key - Available in 1 to 9 Piece Sets, 1.5mm to 17mm, HBL Series from MITOLOY. MISUMI USA has all of your Hex Keys needs covered, with over 3.8M high quality products and 80 sextillion configurable parts available with fast shipping and low pricing.
us.misumi-ec.com