Both have the same level of weapons

VS

I would assume meeseeks army due to the sole fact they don't die or disappeae unless there mission or request is done. They can also be very bloodlusted or dangerous if they have been alive for awhile 😆

Is the Meeseeks’ mission to win the battle? If it is, they win.

If they have the same levels of weapons. The Uruks will slaughter The Meeseeks.

The Uruk-Hai are elite Uruks. They've done nothing but train for H2H combat all their life. The difference in physicals is huge. The Meeseeks are not even peak human by comic book world standards. So they are definitely not peak human by LOTR standards. Uruks are much stronger and faster than humans in LOTR. Another obvious advantage that the Uruks have over the Meeseeks. Is that they are wearing full plate armor. The Meeseeks are literally going into battle naked.

The Meeseeks can still be dismembered and incapacitated. It'd be a horrible way to live but the Uruks will not care.

i mean Meeseeks' have never been decapitated or had their head so caved in its actual pulp... and even if they don't disappear theres no indication they could continue to function properly

The Urks are physically superior and more skilled, with better armor. the Urks should dominate.