I guess for starters I'll lean in favor of Ultron.
I feel like he can take any in this group out. Yet in reverse ... I'm just not sure what they can do to stop him.
While they are being destroyed one by one ... the odds of them finding a way to bring him down are going to decrease even more so.
I'll stick with this for now unless someone can come up with some reasonable ways this group can penetrate his defense and take him down.
Perhaps if Storm can find an opening to effect him internally, the odds could start to go in favor of the team ... but I'm not fully convinced that's possible.
Waiting to hear more feedback and curious to see what others have to say.
I was thinking of this earlier this week, lol. Anyway, with this line up, I don't think the X-Men can handle him. Pretty sure Ultron 17 still had adamantium casing for armor in which case Gambit and Colossus are going to have issues hurting it directly (can Gambits' new power upgrades enable him to charge up adamantium?), and I'm not sure if Wolverine can really fight a being with genius-level intelligence and super speed. the Avengers usually had Scarlet Witch to bypass Ultrons' defenses - this lineup only has two very high level energy manipulators, but I don't think that Storm and Cyclops could destroy Ultron before it outsmarted and then killed them.
Ultron should be able to win.