First off it's gotta be a BX (That rules out VIA junk like the P3V4X). I tried them all, and the Asus P3B-F was the best of the lot. The only thing limiting about the P3B-F is relatively few FSB choices, with 150 being the highest.
On the ram of the day, the P3B-F was the only board I could get 100% at 2-2-2 at 150fsb. The Abits always needed cas 3 witht he same chip and ram. My BX development ended with a C step P3-700 at 1050 on the P3B-F.
I could run as much as 160fsb on the Abits, but the Asus was faster at 150fsb. The Abit's made the highest clock rate, the P3B-F the highest performance. Later ram quality improved to where lesser boards would stand cas2 at 150+, largely eliminating the advantage of the P3B-F.
While BE6 or BH6 Abits were ok, they later BF6 Abit was better. Most people used BE or BH6's because they had them, not because there was no better. A BF6 is a later board with more options, increased stability at extreme FSB, and better cpu support. It is in every way the best Abit, and second only to the P3B-F in my experience.