Venus is ignored because it might as well not exist, due to its Earth-like size and ridiculous surface conditions. All landers sent there have failed shortly after landing (scale of hours).
Its gravity being closer to Earth's is a huge downside, since that means that any rockets taking off would need to be on the scale of the rockets that take satellites into orbit around Earth, if they could even survive the temperatures and pressures. Compared to Venus, Mars is a resort, with low gravity allowing for launching in orbit using much less fuel than would be required on Earth.
Even if you ignore the surface and have people live in floating cities, you have some problems. The lack of surface and natural resources is one. And, you still pretty much need a rocket capable of launching stuff into orbit around Earth since the required orbital velocity is so high.
Mars and the moon are far, far better options than Venus is at this point.
RE: 5 Reasons Going To Mars is a TERRIBLE Idea | Answers With Joe