Fire Demon or Mana Relfection?

Yes, but this is not an "if" situation, this is the real thing. I'll worry about DoT when they actually fix it and make everything stack properly and last as long as it's supposed to.

That's not too wise of an outlook, especially if we know certain skills will see beneficial changes in the near future. End-game should always be the goal of high levels, and as it has appeared reading this thread, Fire Demon is definitely the best choice. I've had both maxed at one point or another, and decided to max FD over MR with the full SP reset given at the onset of Big Bang as the added DoT damage is just slightly more beneficial on an average basis than MR.

The thing with Mana Reflection is that, as stated earlier, it doesn't kick in very often - only 60% of the time and only on magic attacks. I know I'm reiterating the obvious, but it's something you don't feel while playing until you have it maxed and see how pitifully helpful it actually is. If the skill worked like PG with ANY damage received, reflecting at a 60% rate, it would be the no-question skill to max, especially now that it reflects a good 1000% of damage at max. But the bottom line is that you'll still have some points in MR at Lv. 200, and as the difference between that skill's effect (I believe my MR is maxed at 11; I think you're off by 3 points saying one will be Lv. 14 at max) and what MR can do at Lv. 30 is important to note, it becomes clear FD DoT damage at max is much more helpful than max MR.

But, of course, neither help by much.