It's not conductive. Manufacturer describes it as "electrically non-conductive".I've been using MX-4 lately. I don't think it's conductive
Thermal Grizzly Kryonaut usually beats out everything other than liquid metal interface materials from what I've seen. Application method isn't terribly important as long as too little paste hasn't been applied - too little is far worse than too much.
As far as convenience, Kryonaut is annoying to work with. It's very viscous - more so than ICDiamond, if memory serves me correctly. Noctua's NT-H1 probably wins out when you factor in price and convenience with performance.