Given a choice of death by fire and death by cold, death by cold is easier to mitigate against, and is the default problem in space. To survive Venus, you have to first survive the freezing trip to Venus. So you need heating and air conditioning. A lot. Of both.

On Mars, you only need the heating systems that got you to Mars.

Similar problem for radiation: going to Mars leads to less radiation. Going to Venus increases radiation. So in Venus orbit, you need more shielding than you need at low Earth orbit. On Mars, you need less.

There's another commentor suggesting floating in steel balloons. Um, weather is going to be rough. Really, really rough. The mass of building materials necessary to survive the storms strikes me as likely deal-breaker. Never mind the complete lack of light.

I don't know if everything is harder on Venus, but most of the first-order issues are substantially harder.