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Its has no inherit flaws in its structure. It can take on Air Coryell, WCO, run heavy teams, etc. It has high success with every type of offense.
Its the most adjustable defense. And especially in today's league, adjustability and the ability to play anyone at a high level is critical to success.
My personal favorite scheme is the BP 2 gap 3-4. I won't go into detail, Ive done it plenty of times before.
Theres very few 4-3 schemes that I like. John Fox's 4-3 is good. I like Jacksonville's 4-3, but its not necessarily the scheme I like, moreso the player makeup.
To me, a great defensive scheme can't live and die on one thing. It has the ability to everything, everything at a high level. Fox's 4-3, BP's 3-4....those schemes possess that ability.
Blitz heavy teams live and die with it, Tampa 2 teams suffer against the power run game. 46 is vulnerable to WCO. Every scheme has some sort of weakness outside of the 2 gap 3-4.
The only set that can take it on is the 2 TE run heavy offense, but even that set is generally shut down by the 3-4. If you have a big hulking oline, your run game will suffer because they won't be fast enough to stop the edge rush of the OLBs, and the Guards won't be quick enough to pull on the ILBs.
If your oline is small (ZBS), you'll get pushed around by the front 3.
If you have something in the middle, ILB blitzes can disrupt your pass protection (attack the smaller OGs needed to thrive against the 3-4).
At its peak, no scheme is better.
Of course, theres 4-3 teams that play like 3-4 teams, and vice versa. So at the end of the day, its just a formation. But you get what Im saying. This is a gross simplification. We can talk forever on this subject if we wanted to.