Rule 6: Your unsupported feelings about weapon imbues aren't useful.
Rule 7: Make your own enchant decisions.
Originally Posted by Rouncer
Take FT/FT with a grain of salt since all the testing was with the level 80 version of the sim. When Hothgor and I were testing things on the level 85 raid dummies on the Beta we showed basically the same results between all three conditions (WF/FT with agility weapons, WF/FT with caster mainhand and FT/FT with caster mainhand) although the testing conditions were much too short to properly account for RNG. When using the level 80 sim with current gear values and adding in UE and a level 85 priority list FT/FT with a caster mainhand beats the others by a significant margin.
How things will stack up at 85 with optimized raid gear is still up in the air but I wouldn't be surprised in the slightest if a caster mainhand ended up being our BiS if they leave Flametongue the way it is right now.
For levelling, especially in dungeons, WF/FT seems much superior to FT/FT with agi weapons (2x carnelian spikes) from what I've tried since Cataclysm has been released.
Would Enchant Weapon - Avalanche be worthwhile cheapo enchant while levelling? I haven't seen much about it.