Brass, 2" or longer. One pair of should be fine. Go for 2.5" if you want a bit more security, or 3" if it's a heavy door, but most 6 panel doors nowadays are as light as anything.
You can use either type , my concern would be the cheap panel doors , often no internal timber just polystyrene blocks that do not prevent the door bulging once fitted. Had to return a dozen doors like that which all failed.
I'd always recommend butt hinges. I've come across doors fitted with easy hang hinges, and it doesn't look good, and the hinges are never as stong as butt hinges are.
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