With white, like with any color, prep is really the key. Get it cleaned up nice and lay down that sealant, and you won't believe your eyes. The other thing I've found, with white, is that paying great attention to the off-setting dark details (trim, wiper cowl, windows, wheel wells, etc) will really pay off.
As for your actual question, I've had very good results, on my white Jeep, with both Liquid Glass and NXT. I am about to try the Klasse twins, because I've read such great reviews, and I've also read that Blackfire does an excellent job on white.
To be honest, though, while I love the reflectivity and protection of the sealants, I think I truly discern a difference when I top with S100. It's the closest to "depth" I think you can hope for.
