Board Thread:VS Debates/@comment-4450205-20170518023716/@comment-27379005-20170518195505

I think Jotaro wins Round 1 because, at least from what I've heard, his Stand moves faster than light(plus I know he can stop time which Yu can't). Don't remember how powerfull Izanagi-no-Okami was though but I doubt it has what it takes to beat someone FTL or that can stoop time.

For Round 2 though, I think Yu would win. As the above user said, Yu could use all the Personas he uses not only in P4 Arena but also the ones he gets in both animes (Persona 4: The Animation and Persona 4 the Golden Animation). There are many but I'll just mention the ones that would be the most helpful:

Arahabaki(used against Margaret in the first anime): This one would probably be his trump card here considering that it has the ability to repel all physical and gun attacks the user would receive, and considering Jojo only attacks with punches and stuff if i'm not wrong...Yu would just laugh at whatever Jojo throws at him.

Izanagi and Izanagi-no-Okami: His main and most powerfull Personas respectively. The later has resistance(not immunity though) to physical attacks, plus powerfull attacks like Myriad Thruths which is it's strongest.

Magatsu Izanagi(obtained after defeating it's original user in The Golden Animation): It's original user(to not spoil) defeated many of Yu's most powerful Personas in the Golden anime and was overwhelming him in the first one as well. After Yu obtained it, he one-shoted Ameno Sagiri with it(which is one of the most poweful entities in the Persona verse).

Norn(used against the culprit in The Golden anime): One of its default skills is Diarahan, which completely heals the user.

Kohryu(used in the first anime against Kunino Sagiri and Margaret): Has "Salvation", which completely heals the user(and party members) along with their ailments.

And there are some others like Ara Mitama(has super strenght to lift heavy stuff), Yoshitsune,Scathach,Sraosha,etc. So, unless Jotaro happens to kill him before Yu switches to Arahabaki, Yu would most likely win.