If you really want to make good use of your OD, you should play 1-3-1 zone (IMO), because it is made to deny passes to the inside and put pressure on the guards(thus, forcing TO). But this would be quite the debate of advantages and disadvantages
However,
i've heard that using 3-2 zone will help better to protect the inside than 2-3 zone.
in what cases would this be true?
in no cases, actually. but note this:
you use 2-3 zone, when you have:
a monster center with huge ID and poor OD,
two monster defensive guards with poor ID, but high OD,
and two balanced defensive forwards.
If you try anything else this defensive tactic will be a problem.
i have a not bad perimeter d team. would this help?
for 3-2 zone, i think it could, but man to man could be better, it all depends on the level of ID and OD your guys have.
Personally, i think that if you use 3-2 zone defense, against an inside offense, you will definitely lose