Decided to break things down on species and biogeographic lines out of curiosity, keeping it to current holdings for the sake of simplicity:
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As these figures show, it is incorrect to state that the Aspinall collections have the greater range of species, even if one only looks at mammal species where they do keep marginally more grassland species but correspondingly fewer desert species. Overall, CWP keeps more than double the number of category species as a whole. When this is combined with the near-complete lack of any bird or reptile representation at the Aspinall collections in this category, compared to the wealth of such representation at Cotswold Wildlife Park, it is a pretty obvious choice for me:
2-1 to Cotswold Wildlife Park