TY for pointing out.
Then I favor Legion followed by Franklin, and MJJ in last place.
Anyhow out of the 3, I find MJJ realty warping powers the most limiting as he is the only one who is unable to create from nothing (EX-NIHILO). His ability to warp is based on psychokinesis, which explains why he can only reshape existing matter. The danger he presents are his progressive growth in his increase, there was no upper limits to its range. As time progressed his ability to warp reality would threaten neighboring universes with the threat to plunge Multiverse/Omniverse into chaos. Limiting the field, limits that potential threat.
Franklins powers are not as limiting as he can both manipulate and create from nothing. His cosmic awareness gives insight, and extra psionic powers to fall back on like teleportation. Out of the 3 he may be the weakest but since the cap is universal, he is in the right weight class, since the other two a nerfed his level.
Legion has several types of reality warps. He even says he has different personalities, each with their own way to bend reality in X-Men Legacy. That’s beside the point, I get it, the focus is always feats. And in his showing we have seen him manipulate matter, move matter from one to another, merge realities via probability, and create from noting (EX-Nihilo).
The one point that would need to be cleared is if even if Legion is nerfed to universal showings would he keep stamina/juice of being a Multiversal warper. If the answer is yes, then he would be my definitive choice. If the answer is no, Legion would deal Jaspers and Franklin the way he dealt with the Elder Gods he would re-write reality onto a backup, and wipe out in the processes. The problem is he would exhaust himself, and while this could be permanent solution to deal with Jaspers, I can see Franklin easily recover, return, and pick him apart.