Venus has similar gravity to Earth. It is just about the same size and density. The atmospheric gasses can be turned into many different kinds of compounds provided enough energy and you could theoretically mine ore from the surface. It is much closer to Earth than mars as well. We recently detected through spectroscopy gasses in the atmosphere that are associated with the byproduct of life, so scientifically, it makes sense to have a science facility above the atmosphere to experiment further. The reality is that it’s more technically achievable to send a facility in orbit around another planet than to build a ground facility. Far less fuel needed. The gases in Venus’s atmosphere might also be able to be used as fuel.