Good question. I haven't been DE shaving very long. I've tried a few different types of blades:
Derby Extra - I didn't get much irritation afterwards, but the shave wasn't the closest I've had.
Feather Platinum - the Derby experience in reverse, very close shave but I got lots of nicks (it looked like a half hearted suicide attempt!:icon_razz
Gillette 7 o'clock - out of all the blades I've used, this one seems to get the balance of comfort and closeness best.
Astra Green - probably my favourite so far, I always get a great shave with these, I get a little irritation, but this is a little compromise for a bbs chin.
I have tried a few others, such as Shark and Treet but I honestly can't remember much about them.
I think I'll keep persevering with the Feathers though as I've heard so many good things about them- just need to get the will sorted first!
Hope this helps a little.
Chill Bill