If you had the knowledge and funding to build any telescope you could, what kind would you construct (i.e., optical, X ray, radio, or other)?

If you had the knowledge and funding to build any telescope you could, what kind would you construct (i.e., optical, X ray, radio, or other)? Where would you place it--at a location on Earth, in orbit around Earth, on the moon, or elsewhere? What would you use the telescope to study