I'll explain my own situation:
Here, I get to know each member a little better than at Rennlist - so the opinions they offer carry some more weight (or less) based on how I perceive their own strengths and weaknesses.
As an example - many here probably realize that if you have a complicated question regarding cylinders, pistons, or other innards, you won't usually get a response from me. AVJuvat, Lawrence C., SoCal, and many others (can't list everyone here) are better prepared for that question than I am.
However, If I need an answer fast, I usually post both places; rennlist has many more listers that periodically post, so the probability of getting a quick reply is slightly higher.
I read both, and do so too often!
That's my rational anyway - maybe others have different opinions.
For one particular example - the email I sent you with the link to rennlist - I just found the link there by chance today, so I cut and pasted it to you.
