I voted blacks, because several of my favorites are blacks - Cherokee Purple, Indian Stripe, and Black Cherry. But actually my new favorites are pinks - Earl's Faux, and Giant Belgium.
To me, most paste tomatoes are bland and mealy, so not sure why Romas are so popular. Give me a big, flavorful beefsteak over them anyday! The only one I've grown so far that had any taste was Amish Paste. I can lots of tomato sauce and salsa, but I'd rather cook down a juicy tomato with flavor, than to use a meaty, bland tomato. If I wanted a tasteless sauce, I'd buy the stuff at the grocery store.
I agree with the bland taste of most paste tomatoes including regular romas, but I really do recommend trying the opalka which is my main tomato every year now.
Personally I'm not fond of the black/purple types, but I agree there are many great pink varieties out there