It’s subtle differences where you’re obviously swapping a defensive linemen for a linebacker. So you’re going to be a little more athletic against the pass, but a little lighter against the run in the 3-3-5.
There are also concerns along the edges with the 3-3-5 since you only have three down lineman and it puts more contain responsibility on your linebackers.
No matter what they’re running or who is in what spots it’s really just a question of how they feel they best matchup. How much protection against the run do they want? How many linebackers/athletes do they want in the flat for short passes?
Same thing for three safety looks or even something like the 1-5-6 dime we saw a few years ago.
What are the opponent’s strengths and how do we best matchup to take those away and force them to beat us with their weaknesses. That’s the gist of it.