Feather and Astra SP so far. That being said, I've only tried about 20 different brands, and I find myself enjoying the Astra Superior Stainless quite a bit lately. Not as sharp as the other 2, but extremely smooth and irritation-free. Getting ready to order a few more blades to try out, expand my horizon. I haven't ventured far from my favorite blades since I first started wet shaving, so I wanna try some new blades and revisit some ones that I'd eliminated early on
Just finishing testing 30 different blades. Top two are essentially tied - Polsilver Super Iridium and Astra SP
I'm with @Trader Joe. I use a Shark in my EJ DE89. I'm going to use Voskhods in my SA-109 and I'm doing a Focus to figure what I'm going to use in my NEW SC.
Up to now my go to blade has been an Astra SP but just tried a GSB in my FaTip Grande and what a result, so sharp and smooth. My go to blade may be changing, though further testing will be needed.
Astra Superior Platinum Gillette Silver Blue Perma-Sharp Super Polsilver Super Iridium Vintage Brown Polsilver Stainless Voskhod