Which one do you like better?

Aperture Science Research Facility
Black Mesa Research Facility

I choose AppletureAperture Science.

Aperture Science obviously. I wonder how huge Black Mesa is if Aperture Science is...well, huge.

Aperture, they created amazing pomegranate that could never go through.

Reliable Excavation and Demolition

Aperture Science obviously. I wonder how huge Black Mesa is if Aperture Science is...well, huge.

Black Mesa has (guessing around 3 or 5 levels of clearance), thats pretty darn big; underground facility in Mexico.
Aperture Science (modern era is pretty tiny; the 1950s are pretty darn big considering they own a salt refining facility), underground in an unknown location.

Aperture Science. Black Mesa just stole their sh'it.

Aperture Science (Mostly because I don't want my house burned down by combustible lemons)

Aperture Science. Black Mesa just stole their sh'it.

underground facility in Mexico.

Sounds about right.

Sounds about right.

If it was in China, it'd be even greater.