thing about the diagonal one is that it is less likely to block another receptacle.
Now what would be nice is if they could make switching-type power adapters less like the typical wall wart and more long and slender so as to not block other receptacles, or to make a right-angle style with a swivel plug.
When power strips with "transformer-spaced" receptacles first appeared, many of them actually internally still had terminals in between the receptacles where they just removed the "holes" in the plastic injection mold. So they created a power strip with less functionality and marketed it as a new feature at a higher price. Ah, marketing.