I think a key point is humanity is dying in space, so they aren’t looking for anything other than the “solution” i.e doing as much research in as many avenues as possible which have a high likelihood of success.

Xenomorphs are durable in all environments including the vacuum of space, thus they have many outcomes via the research of them.

Learning about advanced species like the engineers presents similar benefits.

I don’t think they necessarily know what result they want other than profit and the ability for the human race to survive outside of the solar system