Disk drags are proven. Anodizing outlasts any kind of coating. Machined frames are stronger and more durable than castings. The less moving parts the better. The fewest total parts the better.
Drags have to work smoothly when wet.
Highly visible colors are best for floating fly lines on big water. Neutral color lines are essential for low, clear water. Anglers using two handed fly rods should carry a full floating line and a Launcher Line type system. For steelhead fly fishing you need tippet material of at least .011 to turn over steelhead size flies at long range. The material should be hard and abrasion resistant.