Six of one half dozen of the other?

I'm interested in opinions on the importance of different qualities for two copies of the same toy. I bought a g1 scorponok at botcon 96 but didn't realize it was missing a number of pieces till I pulled it out of storage recently (when I bought it there was no way to check a list for the original pieces). I decided to acquire the missing pieces but in the meantime ran into a styro and box that seemed to be a very good price. The styro came with a scorponok missing nearly all the pieces. I'm trying to decide which to keep. Both are in good condition with tight movements and working scorpion legs. The one has a gash in the tail sticker and a stress mark on the gray piece on the bottom of the tail that snaps into the back of the robot. The other never had stickers applied (this seem to be a negative) and doesn't look like it was ever played with BUT the metal rods on the leg sides and grommets on the tail are notably but not horribly rusty.