Oi! People have tried other engines in Chippys and it just ain't a Chippy any more without that Dripsy.
I haven't flown a Zlin but it'd have to be darned good to be as nice as the Chippy to fly (I part-owned one for 30+ years less a couple of years out in a Yak group).
I suspect the Zlin's aerobatically more capable, however, as is the Yak52.
Be interesting to hear from someone with extensive experience (not just a few flights) in both.