CBR vs VBR which is best

I realize there have been alot of postings (mainly mine) on this subject but........
Which is best and under what circumstances would you use these. I have been reading about this and it still is'nt clear. I have vers. 2 on my desktop and 2.1 on my laptop. All answers I have suggested that CBR is best, but is this all the time?
Jeff
G4 DP 1 GIG G4 laptop 1.25, MBP 2.0 1 GIG   Mac OS X (10.4.6)  

Jeff:
My two cents . . .
I'm using Compressor 2.0. With the standard VBR presets I use to get some pixelation in particular in transitions. That's solved using same preset changing just to CBR setting.
My projects uses to be short and then a bigger m2v ile size is not a problem for me.
Someone using 2.1 could tell us if the VBR problems have been solved.
Hope it helps !
  Alberto

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