I'd have to actually go with Dirt boss. Scalpel is neat and all, but as a TF I like DB more. I bought Scalpel more because I liked the on screen character.
Dirt Boss. The lottery of trying to get a Scalpel that isn't broken out of the pack swings it for me. That and I used to drive fork lifts so it's personally cool.
Scalpel. Ive never even seen one in the stores, I had to buy mine on ebay :[, And yet dirt boss is an absolute shelf warmer.
Dirtboss is the better toy, but Scalpel is the better display figure. So it depends on what you look for in a figure.
Scapel is the better scout overall. If you want a quick and easy TFing toy, then Dirt Boss is your figure. However, Scapel is both actually in the movie AND he's got more points of articulation in the head area, compared to Dirt Boss' NO head articulation.
scalpel looks VERY nice, but I was dissapointed with playability, which is about 4 or 5 out of 10. His legs are just too damn fragile. I have him right here, and although, he has quite decent sculpting and articulation, he's just too fragile