Fixed blades, I' d have to say Magnus Snuffers, the Muzzy' s are very close though. Also, for a 2 blade head, the Magnus 2 blades do very well.

As for mechanicals, the only ones I have used are the Spitfires which leave an unbelievable blood trail and the 2 blade Vortex, which quite honestly I was dissapointed in based on all the hype I had heard.