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Feathers are really sharp, so they're probably the best bet for a really close shave. Easy to irritate and cut skin though I find. Derby blades didn't do much for me, but they weren't awful. Also haven't tried the Gilletes so I can't really comment on those. The best I've found for me have been Astra Platinum blades.
I've seen a lot of people with a preference for Astra. I'll give the feathers a try and if I don't like those I'll order a box of astras.