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I prefer the Blue one, I suppose. I just prefer it's more slit-like eyes, they make it look a little less cartoony than the Red design.
I'd definitely have preferred if they made it something like Shellos in DPPt; well, in terms of there being two very visually different designs. I don't...
I used it on Thunderus, because depending on the game, Roaming Pokemon can be really awkward. Black and White were particularly awkward in this regard, in my opinion, so I just used the Master Ball on Thunderus to get it over with.
My first 4th Generation game was Pearl Version, in which my starter was Turtwig. I then got Platinum, and my starter was Chimchar. I like them both, better than Empoleon when I eventually had one. Although Infernape is generally just the best :P