i use a gillette 2 blade razor with disposable cartridges. cant use the mach 3 or fusion as i think they rip my face apart after 1 shave and the replacement cartridges are stupid expensive. the 2 blade one works just as well for me and i usually get about a month out of each one, but i usually only shave once ever 3 days.
I use the same one and have faily sensative skin. Especially on my lower jaw/neck area. I usually get like 4-5 shaves out of a razor with those. If I shave against the grain I only have to shave like every other day, if I dont though I gotta do it every day. Damn grooming code at work lol.