Thanks for your replies everyone!
Yeah, Naker, I think chris902 is right about the base offences. If you don't know what they're going to play, or you don't know if there is a weakness you can exploit, and you don't have a specific strength, then the base offences are the way to go (due to the lower reward vs higher penalty ratio). This is why it is recommended that new users use those offences until they work out a strategy.
It looks like I won't receive any quantitative data...
I wasn't really expecting to, but one can hope, right? ;)
The opinions are well received, though, thank you.
peace out- Axis