I honestly think that OVA JJBA was better then the 2015 Version because of many reasons.

First I think that it was more darker as the 2015s was more clear. And I liked the mysterious look of Jotaro and everybody else.

I didn't like the English dub for both of them. 

They didnt sound cool at all. When Dio would say "Za Warudo" It got me hyped up but when I hear "The World!" it just sounds low budget and Cringe.

But the 2015 Eng dub was better then OVA but in general I still liked the Dio Vs Jotaro OVA fight better then 2015s.

I liked how the stands designs looked and the OVA fight scenes were longer and more gruesome.

And thats why I like OVA Better then 2015 JJBA