When i think in this matchup i just cant find a conclusion. We know Doom > IG...and we know LT probably is > IG...in the end i cant make a strong case for any of then. Is impossible to know who is stronger - even speculate.
1.) They are both beyond ANYTHING within Marvel creation(including LT.)
2.) Both are essentially 'God' within the MU, but they're also still confined to the basic parameters of creation itself -- the above powers are not.
3.) MJJ is still basically 'God' within his warp, and is beyond even the effects of nullification. He does have one inherent weakness the above characters do not, though: he cannot create ex nihilo, and can actually be killed in voidspace.
4.) As mentioned above: MJJ-class beings(and above) are seemingly beyond nullification, thus are beyond the UN.
5.) Abraxas is the antithesis to Multi-Eternity, but is still very much susceptible to nullification.
But im not sure if this Eternity feat is that impressive. The battleworld was a "micro universe". I dont know if Marvel ever said the size of the Battleworld, but i would say that is smaller than a Star. And i dont even know if there is other planets or stars in that universe.
The Eternity of this world, could be the Eternity prime, but a much smaller one. In terms of raw power, maybe it could be even weaker than a normal Eternity from any previous universe of the 7th cosmos(?).
I wonder if every piece of land there have a Eternity (because they really work as universe, as we saw with IG)...
Battleworld was simply the only thing within Eternity/creation while Doom was in control. It was only AFTER Doom's hold was broken, that Eternity could be 'repopulated' so to speak.