Ok, I'll probably get bashed for this, but I don't like sourdough as a sandwich bread.
I love a good sour sourdough bread on its own, but for a sandwich I prefer something more neutral, like whole wheat or 7-grain. Sometimes I can even go for rye, but rarely if ever do I find a sandwich to be better with sourdough.
I find the tartness of the sourdough to really clash with the everything else that is going on in the sandwich. Instead of complementing the ingredients, sourdough almost fights for the attention of your tastebuds.
My bread preferences for sandwiches ...
Roast beef: 7-grain or rye
PB&J: Texas Toast, or whole wheat
Turkey: whole wheat
BLT: whole wheat or white
Are there sandwiches people actually prefer with sourdough bread? If so, which ones?