I wasn't really thrilled much by either, but I prefer the torgue DLC overall, including on guns and loot; neither DLC has had enemies that i was really impressed with. Though I do much prefer the raid boss in the torgue DLC to those in the pirate one.
The two items I find to be exceptional from the Pirate DLC are the Evolution and Rapier. Everything else isn't really that cool. The Stinkpot is a pretty good corrosive weapon, and I like it for being an elemental Jakobs I got at the very start of the DLC, but it's worse DPS wise than the Bad Touch. The blood of the Seraphs relic can be really good, up to 25% max health and 1.5% health regen but it recently got nerfed on PC so it won't be good for much longer :/
There are many more items I find to be exceptional in the Torgue DLC. The Slowhand is amazing, and already one of my favorite weapons. It is very powerful, has high elemental chance, and heals you. I am also a big fan of the Crossfire grenade mod. It is much like a bouncing bonnie on steroids. The Meteor Shower is just a buffed up version of the Bonus Package, which means it's amazing. The Kitten is a very powerful assault rifle. It makes Axton almost invincible with the right build (willing, able, healthy, prep) and gear- Neogenator/Evo, Legendary mod, and Vitality/BoS due to it's healing capabilities. I also love the Boom Puppy. It's a gun that fires a grenade with rolling thunder type attributes where it creates an explosion every time it bounces. Also- Dat Cobra is still awesome, despite the fact that no one knows where to find it legitimately yet.