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Starting with DEs I bought a sample pack of the popular blades, worked my way through them, and chose a couple of brands that I like and some that I would never use again.
The same could apply to...

All of the above! :)

If the bevel isn't set right, then it is going to be a bad shave.
Poor stropping can dull the blade or roll the edge. A rolled edge will definitely cause irritation.
Dry...