dear friend,
you are confusing 2 different things with eachother.
If you got a team full of PG's and C's, they'll always play 2-3 against you. So you need to keep that outside option open. This said, you are correct on the fact that at the NT lvl, most games are won by LI and not by RaG. This has several reasons.
for LI
1) you need guards who have OD, HA, DR and PA. Easy to train
2) you need bigs who have IS & RB (and for defensif purposes ID and SB).
that is the very basic for LI ( i'm simplifying things out here. you still need a good SF etc...)
For Outside tactics you need:
1) guards with JS, JR, HA and DR, while having OD for defense.
2) Bigs with JS, ID, RB and SB, allong with passing ( very recommendable to have some decent passing on a big if you are gonna play outside)
Of those 2, which is the fastest to train for team managers? it are the LI players. Futhermore, nobody seems to have the correct players to succesfully play a 2-3 zone, where as everyone has em for a 3-2 zone, so defending against a team who plays outside is considerably more easy than one who plays inside.
And, as dreadfull as it might be, JR takes a hell of a big ammount of salary on guards. So if you a big ammount of JR on your guard.
Never the less, inside tactics are what tends to get the job done most of the times.
Here is another couple of questions for the candidates:
How valuable is SB on your bigmen? Do you find it a waste of time to train IS and ID on your guards?