stone is more expensive. ABA is $18.99 per 6 around here.. DFH is up there too but probably $10-12 for a 6er
Regular ABA isn't sold in six-packs, and it is a much pricier style of beer (American Strong Ale) than anything Dogfish sells in 6-packs. The
Oaked ABA is sold in 6-packs in the $18-19 range, but that's a long-time oak-aged beer that's definitely expected to be pretty expensive--the closest Dogfish Head comp is Immort Ale, which is $17 for a 4-pack (though that's closer to Oaked Double Bastard so you can't really compare prices there).
If you're comparing to 6-packs of Dogfish 60 Minute, Stone IPA would be the appropriate comp. Generally they're priced about the same; around here (DC, east coast), Stone's about a buck a sixer more, but at my brother's place in LA (west coast) Dogfish is a buck a sixer more.
I think Dogfish has some great stuff. *****'s Brew, Immort Ale (once cellared for a year), 90 Minute, Burton Baton, and a few others are great, and 60 minute, Raison d'Etre, the Indian Brown, and others are quite solid.
Their problem is an obsession with uber-big one-offs that tend to be overpriced and have many more failures than successes--somehow they're held up as the premier east coast brewery when plenty of breweries on the east coast like Allagash, Portsmouth, Cigar City, Foothills, etc have much more consistently good offerings even among rarities and one-offs than Dogfish does (so do Bell's, Three Floyd's, Founder's, and Goose Island in the midwest or Russian River, Lost Abbey, Stone, and Alesmith on the West Coast just to pick a few at random).