If you think KT is considerably stronger than Worgen or Night Elf, you likely have no idea what you are talking about.
Pre-6 Worgen is BIS for the character-frame / movement speed buff. (for alliance, that is)
Post-6 KT can be argued, but that 1% versatility doesn't outweigh worgen. Not to mention 2% of 100 damage, is still 2 damage...so
I'd also say Night Elf is better than KT. Being able to body res extremely fast is more valuable than 1% versatility. Not to mention with a flag drop macro, you can shadowmeld crucial damage (however, this can be extremely risky as flag drops DR)
From my PTR testing, Zandi looks to be the most powerful FCs (I have not informed myself to any potential ZT nerfs, so my opinion is subject to change). Tauren are second IMO for war stomp/stam buff