With the 133 FSB on a BX chipset, the AGP would be running with a 2/3 divisor and thus at ~89Mhz instead of its default of 66Mhz on a 100 FSB. You would also get a 1/4 divisor for the PCI, so that would be running at normal 33 Mhz as it would on 100 FSB with 1/3 divisor. The RAM would run at FSB speed regardless... although some extended BX chipsets might let you go hostclk+PCI with that...
The E is more OCable because you could theoretically take it to 1064Mhz on a 133 FSB whereas going higher with the FSB when already at 133, is a bit trickier.
With the Via Apollo chipset, you would be able to run your RAM asynchrously with the FSB (ie., running PC133 @133 but with the FSB @100) and I believe you get a 1/2 divisor for the AGP.
I guess you might see faster framerates for the video if you have it running at 89, but it looks like everything else would be about the same (provided you tweek the Via's memory bandwidth which I think is 2-way by default)...