Verified answer

Dragonborn is the best Skyrim DLC. It has a better storyline than Dawnguard, and adds allot of new things. In Dawnguard you get two new locations. With Dragonborn, you get a whole new Island full of locations they had to make a new map! Dragonborn has a better storyline and gameplay. However Dawnguard does add some cool new item such as crossbows and dragon bone weapons. If your only getting one, get Dragonborn. However they are both good and of you get the opportunity you should get Dawnguard for the little details it adds (like the vampire lord ability and the new weapons/ items).

i think dawnguard because you can get crossbow, enhanced crossbow, dwarven crossbow, enhanced dwarven crossbow. (i got dragonborn first i didn't really like it *** much as dawnguard) i suggest getting dawnguard then get dragonborn after or just get them at the same time.