All I know is going through the gates is way harder with ZO than with PP.
Who cares which one is easier or harder to ski behind the fact is you did something you've never done before and that's what this sport is all about, beating YOUR personal best. Doesn't change the rankings, doesn't change your place on the podium. All I can say is NICE JOB!!! Keep up the good work, because I'm not comparing my passes in practice on my lake behind a Malibu and ZO to your practice pass behind your boat, PP and backwash. Stay thirsty my friends!