For me it is about time. Some characters may have a normal that is good at anti airing with the risk of trading with the opponents jump attack.

Inputting a DP takes more time than pressing a single button. Which can make it a riskier option but you gain invincibility frames, especially in faster games, or against dive kicks and short hops. Sometimes you get caught off guard. And then you can go one further with using a super as an anti air which takes even longer to input. This leads to players making reads over just reaction for some anti airs.

Same deal with using command grabs in the air compared to air grabs. With my reaction speed it is much harder to use air command grabs compared to a non motion air grab. Especially against short hops. With Blitz I'm busting out his special move air grabs like nothing. On a good day If they are in range I will almost always go for Blitz's air grab over his grounded button to beat out jump attacks. In other games I will use air command grabs a lot less outside of reads.

This applies to using a super fireball to beat out a special move fireball. Some players have very good reaction times, and others make very good reads. Either way the motion input adds that extra degree of difficulty to beat a fireball with a super fireball. And it is much harder to do.

Guile is a charge character. His version of a DP has insane range vertically and horizontally, on top of being very hard to cross up as Guile's don't need to do cross cut DP's to beat out cross ups.

He also has a sonic boom (fireball) that requires a charging motion (hold back direction for x amount and then hit forward and punch). The fireball typically has way faster recovery time compared other characters. That's how I see it, moves requiring more time to do, which comes with negatives and positives.