Feather for me. CWS doubles their longevity. But if required I change them as often as every 3 shaves up to a work week.
Wilkinson sword classic and Gillette platinum, can't really which is better I alternate between them every now and then
Derby, Wal-Mart Wilkinson Sword, Shark, Voskhod(after the first shave). Pal carbon steel SE Vintage Schick Injectors.
Astra SP's and Feathers are my Favorites. I've yet to have a bad one of either of these blades. However I do tend to end up with a few weepers when I use a new Feather. I never even feel it, just see the blood start seeping out...
Personna Labs/Meds are my blades of choice. They're both the same except the Meds get more sterilization. My next blade Feather. I should go back around to Astra's, open up the Sharks, hit up the red IP's... My dad says that the Israeli Crystal blades work wonders for him, so I gave him all my Crystal blades. He likes Personna Labs too. He's more lucky than me and can get a good shave from any blade it seems like.
Sorry I took so long to get back to you. With 2 passes, Feathers are perfection on the second, third, and fourth shave. The first shave is just as smooth, but you've got to be careful. They start to die on the fifth day, and I usually don't try to get more than 5 or 6 shaves from a feather. In the shake sharp, I can easily get six shaves, 3 per blade edge.
The Astra SP's "have" replaced the BlueBirds as my go-to razor blade . However I'm now trying Voskhod. Med Preps, Red pack Personna, Green and Yellow 7'oclocks, Sharks have all been good also