I ordered 5 Greybull scopes last year and had a fanstastic experience. Great glass, good reticle and Don is a pleasure to deal with. I have had Several Huskemaws in the past as well. Just don't like the weight or the bulk. Both are good scopes and would be a good choice.
I'm shooting the blue diamond on my 257 wsm and have one ordered for my 6.5 wsm i'm building. I love my huskemaw. A good friend of mine shoots the grey bulls. We shoot our guns side by side and switch while at the range and have decided they are equal in perfomance. I will stay with my huskemaws and he is staying with his grey bull. Both excelent scopes.