There may not be any concrete evidence, but there is certainly more than enough personal observation on this forum that shows DE is better for the skin than cartridge, if only because you are being more attentive.
[URL="http://badgerandblade.com/vb/showthread.php?t=62081"]My Hall of Fame Entry[/URL][/SIZE]
[SIZE="1"][I]Fraternity Brother[/I]: "You have been shaving for 20 minutes!"
[I]Me[/I]: "Yeah, but have you ever seen a face this smooth?"
[I]Fraternity Brother[/I]: "It's all just going to grow back again tomorrow..."
[I]Me[/I]: "Then I'll shave again in the morning..."[/SIZE]