Better to go to Venus. You could build a shirt sleeve environment if you were ok living just above the cloud layer. Ample material there for making water, growing food, etc. Think Lando Calrissians cloud city. You could walk around on an open balcony in a place like that with no equipment.
Regarding Mars: there is no reason to go to there other than to say, “hey look, we went to Mars.” There is no profit to be made. There are no new technologies to be developed which would make life on Earth better for anyone. We have already got Teflon from the Moon Lanch. How would life on Earth be any better for anyone here if an Earthling were to go to Mars?!