Guero

I love the fat dragon model, but I don't know which one to get, should I pick up the Gordrakk or the megaboss version?

New player, pretty clueless about how to use my gore gruntas. What's the best weapon for them to use: pig iron choppas or gore hackas? Also, if I have 6 of them, would it be better to run 2x3 or just one big group of 6?