There's a few that have done me well mate. Fishy Peach, Condensed Milk, Devils Dung/Cheese, obviously the Pineapple/Butyric, and I use the none flavoured ones for suspending alternative hookbaits too. But the one that's consistently caught me the rare/special fish is the Strawberry Scopex.
There was a very rare double row lin I had a couple of years ago on them, it hadn't been out for 3 years. A pal of mine was trying to target it so I put him onto the Strawberry Scopex and guess what - he caught it.
I am of the opinion that buoyancy/performance and colour are actually more important in a pop up than flavour, but there is no doubt that Strawberry Scopex has something about it. I've had a few rare'n's on them.