SwisserAI vs zoov.dev: a credit is not a credit
Both platforms publish what each thing costs, which puts them ahead of most of this market. But the two price lists are written in different currencies, and once you convert them the picture changes completely. Here is the conversion, and everything that follows from it.
Pick zoov.dev if your work is editing and shrinking assets you already have. Their bulk optimizer, their Photoshop and Photopea plugin and their livery UV tooling are real, and we have no equivalent for any of them.
Pick SwisserAI if your work is making things that do not exist yet. It is also three to four times cheaper per image, your unused credits survive the month instead of resetting, and the free tier hands you a file instead of a preview.