If your choices for trade are only the Terminator or Big Bang, go with the big bang.  The Terminator is a great ball, but it's a true oil ball that will be prone to rolling out on anything less than heavy oil.  

If you have other choices, something like the World Class Particle, wonderful ball, ranges from medium to heavy.  The Black Pearl is a very similar ball, but the WCP can handle a little more oil.  There is not a significant difference between the two, but the extra oil ability can come in handy.