I personally tend to think better when I'm away from the computer.
Coding on the IDE helps me to experiment and quickly put something together that works.
But thinking while writing things down or while walking is a slower process, so it helps me focus on nothing but the problem obvious edge cases, different solution designs, etc...
So by thinking about the code away from the IDE first, then by polishing my ideas on the IDE, I usually end up with higher quality code.
But since it's less fun to do things that way, I just tend to do everything on my IDE.
Coding on the IDE helps me to experiment and quickly put something together that works.
But thinking while writing things down or while walking is a slower process, so it helps me focus on nothing but the problem obvious edge cases, different solution designs, etc...
So by thinking about the code away from the IDE first, then by polishing my ideas on the IDE, I usually end up with higher quality code.
But since it's less fun to do things that way, I just tend to do everything on my IDE.