[adtac]

jk is better (TM) because it is a noop when already in normal mode :)

Also, pressing two different keys is faster than pressing the same key twice

[foo101]

Is it? djk in normal mode would delete the current line and move the cursor one line up!

d<Escape> on the other hand would cancel the operator-pending mode for delete and do nothing.

[vagab0nd]

Is this why you didn't write "jk" at the end?