I don't have Zola. Just barely got Barbastroff from last Gold Rush event which was my first time and it was fun
Seeing Zola is like a Percis only in class since I assume Zola is more improve version due to stats and abilities if you want an artillery officer - I never used Percis or her class that much except for the Total Domination event which I still to max lv Percis as she kept dying on me LOL
I don't think I use artillery officers over mages since artillery officers are more niche in usage