25M LFR, you can stand in fire, half the group can AFK and you still down the boss
10m Normal, unless your group is OP with the right classes or gear. You pretty much need everyone playing correctly, depending on fight of course
10M is far more of a team effort than 25m LFR will ever be, of course it should be that way because you're not ever going to get 25 people from different servers to actually play as a group
So the real question is, the difficulty of 10M raiding or even 25M raiding is how well the group does as a group, everything else is easy. It seems to get people to listening and do what they need to do is the hard part of raiding now a days.
10-man normals in most cases are easier than 25-normals. First exception I found was heroic jin'rokh.
25-man heroics are also usually easier than 10-man heroics. I didn't so much mean normals as I did not LFR. --- Formerly known as The_Great_Geno. MapleStory IGN: Leaphetamine, Scania http://www.wowprogress.com/character/us/mal-ganis/Taytaytaytay