I really like Rag and how you can plan to set him up to only have good outcomes (killing an 8-8 or get lethal) but I just find that all the swarmy fast decks in Wild after ROS are causing him problems, as his bombs often have a hard time finding a good target.
Rag is much, much faster but TLK is defensive and has more value potential. In a decks like Evenlock I think Rag is better as you need a finisher to kill slow decks before they stabliize. In control mirrors, you pretty much chose to be the agressor if you run Rag over TLK.
I only grind to rank 5 nowadays as Legend just requires amounts of time that I do not have sadly. I just feel like Ragnaros helps midrange decks stabilize or push for the wins way better than Lich King, as many of the spells Lich King generates are very underwhelming at times and the fact that it has taunt is not really that much of a plus as most decks usually remove it straight away anyways.
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