Scrimmage vs 3-3 stack

New to the board - here in Texas - just happened upon it and really have enjoyed the topics - I have been coaching for 18 years - the last 6 as a head coach - many teams in our area have gone to the 3-3 or 3-5-3 look - blitz, stunt, etc.

We are a new zone team - started working on it this past spring - topics are saying that inside zone is a good play and off tackle is good to.

here is my question for you guys.

Double twins gun - inside zone or outside
or double tight - inside zone or outside

Talk about aim points and strategies- suggestions also.

We do both - I am wanting to make sure we are sound and not just running a play to be running it.

your thoughts are much appreciated and respected.

thanks,
Smash