First let's look at the composition of the atmosphere of Venus. Venus has an atmosphere that is way over 90% CO₂ (Carbon Dioxide). That means that no human would survive because we need to breathe oxygen.

Plants can grow in high CO₂ conditions because they use CO₂ for photosynthesis -- in fact sometimes we pump CO₂ into greenhouses to help they grow more. This would make plants slightly better off on Venus. But I want to emphasize that although their CO₂ tolerance would make plants better candidates than humans, there are other factors (like very high temperature) that would not make them good candidates to survive on Venus.