Veer Scheme or Loop scheme in Triple option

When do you coaches run veer or loop blocking scheme. Do you always run veer scheme vs. a 5 tech four man front and always run loop scheme vs. a 4/41 tech. five man front? I would like your reason and rules for these blocking schemes. I've seen some coaches run loop scheme vs. a 5 tech.? Just refining my playbook and want the best blocking schemes and rules possible. Thank you

I posted this on the option under the center thread also.