I've come to believe (and I think mparker762 and I are in agreement) that horsehide isn't as good as latigo on it's own, but that's not the whole story.
The job of a strop is to 1)remove oxidation, 2) draw out the metal (restores sharpness), 3) and align the edge (provides smoothness). I think that latigo is better at jobs 1 & 2, but horsehide does a better job at job 3 than latigo. Additionally, the linen does jobs 1 & 2 better than latigo IMHO
Therefore, I always recommend a horsehide/linen strop for optimal results (my razor maintenance is significantly better now that I've gone to horsehide and linen)