i never tried the first one, but the second one is the worst piece of junk that ever passed gas.
every one of those i've had have leaked. two of them leaked right out of the box. and i don't mean dripped, they poured fuel out like they weren't even there.
they also have a very low flow capacity. i believe they are a major cause of WOT sputtering, because after i changed mine it went away, but that's still open to argument: http://motorbicycling.com/f34/your-b...eed-24880.html
i've never tried the SBP one but it's probably pretty good.
i prefer the old Tecumseh style: