For me, it’s Catal, specifically the paella (either chicken or seafood). The appetizers and wine list are also good, and the service is prompt without making you feel rushed.
I don’t think I’ve ever tried that House of Blues. Either the line was too long, or the people I was with didn’t want to go.
Going along with Catal, I love Uva bar because the Uva street fries are addicting, they can make a mean cocktail, and I like sitting in the center of the Downtown Disney walkways.
I love having a drink at the Uva bar in the middle of the street area, but, for most favourite, Tortilla Jo’s is a MUST EAT for us whenever we go to Disney. We always eat outside on the patio enjoying food, drinks and people watching. The lime margaritas are a small slice of heaven and they go down WAY too easily! 
Earl of sandwich! They are really nicely wrapped so you can take them back to the room.
Tortilla Jo’s ! LOL how could I forget rain forest café!
I like Earl of Sandwich. I wish they had more seating since they are so popular.