Just ask yourself: what is more important to you and the role & self-concept of a modern zoo - the sheer number and diversity of species (you are interested in) or the husbandry quality of the kept species? If a zoo kept said common spet store pecies, but at excellent conditions, I'd appreciate this more from an ethic and educational pov than a zoo that keeps a great diversity of species but all (or most of them) at inadequate conditions.
In this case, the ectotherm husbandry in both zoos appears to be upgradeable. And while I usually support zoos with a nice collection of venomous snakes, their husbandry at Cabarceno isn't up to date.