Harder professional sports job - MLB catcher or NHL goalie

Both jobs will shred the player's knees.

Both have rock-like projectiles flying at them at 100mph.

One is on skates

One has a much more difficult stance and less protection/padding and more susceptible to injury.

One has to play offense as well and in on almost every play

If one gets hot in the playoffs, he can basically win a championship for a team by shutting off the opposing team's offense.

If the ball/puck gets past either of them, it's bad news.