"Out of these main 5 meat varieties available (beef, chicken, fish,
pork, buffalo), which do you reckon are the two best ones to
cook on a barbecue (or the 2 that are your favorite to cook that way)
and please explain why, for each one."

You left out Troll and Newbie. Both of these grill well, although
Troll
is much tougher and will never taste good.

Greg Zywicki