I'm pretty new at this...But so far DERBY
For me, it is a tie between Walmart 'Wilkinsons and Merkurs.
I dont have that much experience yet. But worst must be the Supermax Blue package version. I thought i did a great deal buying a few hundred for 6 £. Tried a few out and they where very dull imo. I gues i deserved it since i didnt do any good check up before.
But i did a bit of more research and decided to try out the green yellow ones. Much sharper and better imo.