For those who wants info on Lille
Lille is a master Sniper who always hits the vitals of his oppnents,he is a man who makes his job top priority and is described in the mentality of "Shoot First,Talk Later"
Jilliel Lille is always at a state of constant Intangibility so conventional attacks wont harm him.
In Jilliel,Lille can fire multiple X-Axis's from the holes in his wings (When Lille uses it,No Projectile is fired instead any matter that it was pointed at is pierced the instant he fires,It ignores durability)
In the special case that Lille is somehow harmed,he has a monstrous Low-High Regenerationn and the wound he took will fire a spark of light that can fatally wound his opponents.
Lille is also capable of binding his opponents in place through unknown means trapping them in place for easy well-placed shots.
Oh and he can also teleport.
The Only time lille was defeated was with a reality warping attack and even that wasn't enough to put him down,He was utterly defeated when the shinigami's used a convenient plot device to put him down xD take note he wasn't dead even so he was still alive but he was severely weakened
That's pretty much the general info
As for my vote
This devolves around "Who Kills Who First"
Both of them are capable of Killing Each other
But ainz is a lot more limited with his options to kill lille due to his Regenerationn and intangibility He needs to use TGOALID or other insta death hax to kill Lille for good from the start since lille will legit start this match off with an Insta-headshot and fatal x-axis's to multiple parts of his body
Take Extreme Note of this:Lille dosen't play around,He dosen't love fighting,He dosent care about observing his enemies for information,When he has to kill,HE LEGIT WILL
Add the fact Ainz is basically at the mercy of the X-Axis,It dosent fire anything and whatever it is fired towards at is instantly pierced regardless of the durability,The only way you can avoid it is by aim dodging (which is much harder in this form since you would have no idea where lille fires or aims from the position of his wings and you would have no idea what hole fires it from the multiple holes in his wings)
But that dosent matter
Ainz has no info on lille here,He has no idea how lille attacks or what lille will attack.For all we know he migth have died before he gets the chance to attack lille.
The way i see it
Ainz's tactical and careful behaviour will bring about his death here,Observing Lille and Gathering information from him will do him nothing
Meanwhile while ainz is busy observing lille and testing out attacks on him to gather information
Lille would have placed an x-axis on his head by then.
So basically Unless ainz starts off with insta death hax,He loses
but even if he does,Cast Time is a thing and the x-axis is virtually instanteneous.
Im Voting Lille Barro