CR
Grievous vs. Vader...Feats of Strength!
Grievous and Vader are in a contest of Strength.
Round 1) Grievous and Vader must lift a 300 pound weight and carry it one mile. Time is not a factor.
Round 2) Grievous and Vader must arm wrestle.
Round 3) Grievous and Vader must see who can beat down who with power blows with a lightsaber. Grievous is only using one and has his arms locked. No Force.
There's a full day's rest between each feat...
DAR
Re: Grievous vs. Vader...Feats of Strength!
1. Grievous - he was strong enough to smash but a big dent in the wall of a starfighter. Vader may be equally as strong but he couldn't carry the weight as easily for as long because he'd get tired.
2. Grievous, I'd say. Snapping someone's neck with one hand is impressive, but smashing a starfighter hull is more so.
3. One one hand? Vader wins since Grievous isn't used to fighting with one hand and might have never done it before - Vader consistently fights one handed.