In order:
RAW, ECW, then Smackdown.
I like RAW the most because it is obviously the superior brand, and most entertaining of the 3. If there is a guest appearance, draft or major announcement, it's bound to take place on RAW.
Next, I love my ECW. I am a huge fan of the original, and almost as big a fan of the new brand. I like the direction they are taking with the young amateur talent as a developmental brand. This is pure wrestling at its' finest. I think this pays homage to the original ECW, which was a cross between hardcore and the technical wrestling we see now. Another thing I like about ECW, is the fact that here in Canada it plays at midnight on Friday. I always enjoy staying up late and watching good, solid wrestling on ECW. The theme with ECW on Sci-fi is ideal for late-night, especially now with the Boogeyman.
I'm a fan of Smackdown as well. If I have to miss an episode or a few matches, not a big deal though. Especially if that match is Deuce and Domino. I can't stand those queers. I like Smackdown for it's smash-mouth style and Finlay is a real asset to that. However, one thing that discourages me about Smackdown, is how they are so economical with their talent. Theoretically, this is a good thing, however we end up with stupid characters like King Booker (originated from SD), Jimmy Wang Yang, Deuce and Domino and now these 2 new clowns, Jesse and Festus.