I would say soccer. For baseball you do need good coordination and power, but the players stand in one spot half the time. For soccer the players have to be in action for at least 90 mins and controlling a ball with their feet around many other players, timing the passes/shots, and for goalies reacting to a ball at insane speeds.

From an athletic stand point soccer crushes baseball. Professional soccer requires tremendous stamina and speed. But the concentration in baseball is always much harder and probably requires the most concentration of any sport. But for your question which takes more? i would have to say soccer. an MLB game is played nearly everyday becasue the players aren't that worn out but a good soccer game will usually break you by the end. MLB season 182 games MLS season 45 games.

Soccer takes more stamina to play as they are non stop on the go, Baseball however requires more skill and coordination to master (you try hitting a 100mph fast ball)

definatly soccer, a soccer player has to keep up his shape and stamina through 90 min games where they can lose up to 5lbs from running.

is baseball you have to play offense and defense while working a team but soccer requires the same so which sport takes more athleticism and concentration to master/win while working with a team