Shaemus/Del Rio is the winner here. But I'll throw out two others for consideration.
1) John Cena vs Randy Orton. As much as Vince wants this to be a legendary all time feud, I've always felt like these two just never click together. They'll put on decent matches at best against each other, but most of the time all of their encounters usually feel very mediocre and color-by-numbers.
2) Charlotte Flair vs Natalya. Both of them are great wrestlers on their own, but man, any time they faced each other they tended to put on really boring matches. Natalya is also not in the same league as Charlotte on the mic.
Hunter vs Daniel Bryan is probably HHH's best match, though.