Quote Originally Posted by Autocon View Post
If they are all the same, no it doesn't matter which one.
Cosmetically they are quite different, and also entirely different characters.

Pics!
Big Convoy
Nemesis Prime (heh, I remember this thing shelfwarming at Kmart)
Ultra Mammoth

I personally think Big Convoy is the best looking of the bunch. Has the most realistically coloured beast mode. Nemesis Prime and Ultra Mammoth would be toys that one would opt for if you want those particular characters - but if the characters don't matter to you, then I'd go for Big Convoy. If even the colour scheme doesn't matter to you... then uh... go for whatever's easiest and cheapest for you to find.
http://www.ebay.com/itm/Transformers...item1c30207310