What would that be? A 386, a Pentium (Pro, II, III, 4 and etc.)? A Core 2 Duo (Quad, Extreme)? Basically what is your favorite CPU from all CPUs and eras, be that Intel or AMD or VIA or any other brand? That's a pretty tough question because even I, myself, cannot provide an easy answer. There's the beauty of the old generations mixed up with the diamondlike modernity and calculation richness which melts away the cycles on the newer CPUs. It's all a turn of the dice.
Give it a shot!
Give it a shot!