Not sure about the V10/8, but generally the higher you rev, you higher your compression can be. I'll guess for V8 having higher compression, but it's just a guess about F1.
Formula 1, 57, died Thursday, Sept. 13, 2007
Born May 13, 1950, in Silverstone, United Kingdom
Will be held in the hearts of millions forever
Rest In Peace, we will not forget you