I never really look at the shop thoroughly, but I think the pink hammer is new. Since the red hammer is actually from the game I have to go with that one. Since online is ending for NL and all of 3ds/Wii U I have to go with the original in game version.
Pink is so cute, but in this case I prefer the iconic classic. Maybe if it was pink and a neutral colour like beige, not a big fan of the pink and green combo.
I personally like both (at least for the beach carnival look in my lineup ), but I do think classic red will always have a special place since red is my favorite color.
I love the pink one so much because I mean its a pink hammer duh. Its super cute! But the red one is so iconic and makes me so nostalgic for New Leaf so I choose the original!