Joshua Randall
Legend
Everyone is forced to participate in combat, so I don't have any problem conceptually with everyone being forced to participate in a skill challenge.
However.
In combat, you get to use your best stat (usually) to attack with one of a number of powers of your choice. Very, very seldom will none of your powers work.
In skill challenges (assuming you're forced to participate), you might not get to use your best stat/skill, and often the choice of skill is taken out of your hands. Very often none of your trained skills will work for that part of the skill challenge.
Also, in combat some enemy is actively opposing you. In the vast majority of skill challenges, you're rolling against a set DC, and succeed or fail, it doesn't attack you back.
However.
In combat, you get to use your best stat (usually) to attack with one of a number of powers of your choice. Very, very seldom will none of your powers work.
In skill challenges (assuming you're forced to participate), you might not get to use your best stat/skill, and often the choice of skill is taken out of your hands. Very often none of your trained skills will work for that part of the skill challenge.
Also, in combat some enemy is actively opposing you. In the vast majority of skill challenges, you're rolling against a set DC, and succeed or fail, it doesn't attack you back.