Which planet in our solar system is most habitat besides earth?

Answer 1

That's a bit like asking which rock is the most nutritious.

Mars is not by any means "habitable", but it's probably the one requiring the LEAST amount of protective gear for a human to stroll around on the surface. On any planet, humans would need, at the bare minimum, an oxygen supply. Mars is very cold in most places at most times, though midday near the equator can reach tolerable temperatures. I'm not sure if you'd need a pressure suit, but it probably wouldn't be a bad idea.

Unlike on Venus, Mars' atmosphere is not actively corrosive, and unlike Mercury it actually HAS an appreciable atmosphere ... it's thin (about the same as on Earth at 25 miles altitude), but it's there. The outer planets don't really have surfaces in the conventional sense, so Mars wins kind of by default.