I don't always rank by scoring, but when I do, I use Xolti's partial scoring sheet.
Personally I am partial to SoS rankings in tournaments, half the reason is because I'm lazy in figuring out points and the other half because SoS negates a blowout causing a huge shift in rankings. I think ranking by scoring is most useful in really small tournaments (8 or less players), and maybe in rolling rumble style matchups.
Please
download @Xolti's updated partial points scoresheet to include the last D&D wave, but, more importantly: all the VC units to date. (Don't forget that heroes with 1 life aren't listed, since of course there's no partial scoring there.)