People are saying they've now got some Grevy's zebra and still some of the old Chapman's (not in the same place)
Grevys would certainly be more striking and from a conservation point of view more valuable but aren't Chapmans used more frequently in mixed exhibits due to their size and temperament? I'm sure that in the wild they live in mixed herds though so it could be possible. Would be strange to hold both and exhibit them seperately.