How much better are Weinmann Centerpulls than Sidepulls?

So I have a pair of Weinmann 999 Vainqueur center-pulls as well as a pair of 605 side-pulls. I know the Vainqueurs work well and are reliable brakes, but with a current build I'd rather prefer to streamlined aspect of the 605s. Just due to the differences in the technology I'm sure the center-pulls work better, but my question is how much better? Do the 605s work well enough to hold their own?

Thanks!

-Gregory