What difference would it make what version Phoenix? The Force itself was almost completely destroyed by a planetary level EMP attack. I think it's safe to say the Odinforce can produce an EMP attack on that level. If Xorn did it, the Odinforce should be able to.
I find it hard to believe that a force as fundamental to the universe as the Phoenix Force being almost completely destroyed by an EMP attack isn't PIS. And at the height of its power, the Phoenix Force >>> Odin Force.
How do we know this? Using only canon showings, Odinforce has infinitely better feats than the Phoenix Force. Hell the Odinforce has more impressive fights than the Phoenix Force too. And unlike the PF, the OF has never been shattered into a billion billion pieces and almost died.
I am baffled. I hate Jean Grey and the Phoenix Force and I still know that the Phoenix Force sabotaged itself in Morrisons Planet X arc. Jean Grey had to die so she could ascend and carry out her Phoenix work. Jean Grey even says that she's not sure how long the PF will allow her to stay.
OF Thor wins. We've already seen him shut down the world's media signals and whatever else he did (maybe electricticity? Can't recall) during that Captain America "death" tribute. That seemed liked a pretty casual use of power from him. He could shut down so many things on a planetary level if he had wanted to that the Zopzop theory sounds plausable.
Thor once defeated racheal summers he used an antiblast against her and she fell down badly injured...Thor wont get down easy, if thor used his Godblast against phoenix maybe he can defeat her, also if he used his other divine poweres. Rune lord thor will probably own phoenix... he was effectively omnipotent. Pluse thors Godblast the maximum damage it can do is rip the fabric of the universe...so yeah myabe he can slay phoenix if he used his godblast...thor can also destroy galaxies with his godblast..