Soccer is more physically demanding. Granted all the other sports mentioned here are physically demanding as well, but from not only the experience I have as an athlete, but the knowledge gained in sports medicine classes in college, soccer is obviously the more demanding sport.
Basketball is a very demanding sport when you consider the sprints that the players have to go through, but like mentioned here, they are very short sprints and half the people that play are over 6ft tall anyway to it doesn't take that long to get across the court. Then its a bunch of passing and quick movements, but endurance lacks. Its mostly anaerobic. Plus, with the combination of using hands and legs, does make it a bit easier.
However, in soccer not only do players sprint long distances, but in between (if they're a good player) they will be jogging or running the whole time, considering when the ball isn't around a player, they should be moving constantly to get in a good position. And when the ball does come near there's a lot of checking to and away from the ball. That involves sprinting. Its a combination of aerobic and anaerobic. Its very demanding. Plus on top of that, you aren't just throwing a ball to someone a few feet away, you may be trying to cross the ball over 30 or 40 yrds. Its a bit more difficult when you have to use your feet not only for running and cutting, but also to handle a ball at the same time. Basketball players don't even have to pay much attention to their feet in relation to the ball. Just the fact that everything in soccer has to be done with the legs and feet make it more demanding. I could run down the length of a soccer field and shoot a basketball in a a net WITH MY HANDS a lot easier than I could run down the length of a soccer field and then shoot after having used most of the energy in my legs.
But like I said, both are hard. I wouldn't expect a basketball player to step onto a soccer field and have the conditioning for it, but like I wouldn't expect a soccer player to step on a basketball court and have the conditioning for that.
I will make simple google, if you find One result in favor of basketball. feel free to post.
Skill is learned? how come we don't have a Ronaldo in every corner?