I lost IoC today as Alliance. A disgrace! But I topped damage and that's all that matters On topic, FDKs really do dish out respectable damage in BGs but I don't really see them going 20-0. In fact, it's rare (if ever) to see anyone go 20-0 (the Wrecking Ball achivement) though I did do a respectable 18-0 the other day as destro.
If you're going for pure single play, I think melee might be the better option. As ranged it's an extremely tough fight vs melee