the responses are almost infinite.
what matters is the identity that you want to give your team. I had an extensive experience at B3 level with centers who had ID SB RB 58 (excluding IS) and had high OD, also at nt level and i can attest that such players are excellet for 3-2 but at a much higher level i realised a different mix would have been better. alternatively there was one of the more impressive b3 winners who had a team suited around 2-3 which is much harder to attain.
ideally you build your team around what you have, then purchase and develop in order to have some flexiblity.
but if ther is one constant, at the highest level, the average OD for a good defensive player is id22 not od 20 or 19, but as i ve said it depends on the specific needs and context.