I always let my ears guide me and try different configurations, but usually the end of whichever tracks and it seems to have a bigger effect, especially on heavily distorted guitar etc.
On more acoustic sounds with less FX, I'll add a touch of saturation at the top and drop some gain below.
Sometimes it's only the bus, and most vox on both bus and tracks.
Generally speaking that is at least a starting point for me depending on what I'm going for. lol
I also seem to use the tape emulator more than any other across the board so far, and at least at the end of the chain it makes a greater overall difference usually, and I like what it does with some light compression behind it.
Especially on smaller projects for some reason, but they do sum across almost any project real nice.
Maybe I'm just strange. lol
Thanks for the blog link Mel .. helpful info!