I'm using the KME jig that's basically a higher tech Lansky meaning it's not used with conventional stones. Each KME stone is held in a retainer and a stick. This system makes bevel angles almost limitless.
I also use a sharpie to determine the bevel setting but it's important to know that the exact placement of the broadhead or knife in the vice does have an effect on the bevel angle. 20% is not always a true 20%...it depends on how "deep" you clamp the head. That's why sharpies are so useful.
As to the OPs question, I shoot Grizzlystik Samurai 200s. The 200 is easier to sharpen than the 150s because of ferrule clearance. If you keep the original bevel angle on the 150s, the tip of the ferrule makes contact with the stone.
Whatever brand you choose, picking one with a low ferrule will be less problematic to sharpen.