If I wanted to move a standard servo around 90 degrees then back to its starting position, does it matter if I used the regular servo trigger or the continuous rotation servo trigger?
Either will work.
The regular one moves from A to B as long as you have a switch closed while the “continuous” one goes A to B with a momentary button press and B to A with a second momentary button press.
Note that either only allow for 90 degrees of travel.