I must say as a proud owner of he Stereo Pulsar that it all depends on what you’re trying to do with the effect. The SP might not have the grit of tubes, but it isn’t sterile or cold at all; it has all the analog sound you’d want.
I think the Stereo Pulsar can get some experimental sounds since it’s maxed on Depth near 1:30 and after that it gives a weird phaser/ring mod kind of sound while the wiggler is more smooth and refinate. Both can pull a really sweet tremolo though, so I’d say you match both with your guitar at the stora and see what you like as of Versatility, Tone and whatever you wanna achieve with the effect.