Hi,
yes that can be very interesting debate but I am afraid it is very context dependent and it is also important to answer few basic questions in advance.
1) What is the difference between IFV and APC? In CW era the distinction is pretty easy, APC is tracked or wheeled armored vehicle with usually HMG armament whose task was to transport and unload infantry. IFV is a tracked armoored vehicle whose task is to escort tanks into the battle. Its armament is either anti-armour cannon or autocannon. The side efec was that IFV has usually 30 % less dismounts than APC.
So what makes IFV to be IFV? Its role or armament? Today the boundaries are blurred. Is Stryker with HMG APC and woth autocannon IFV? Or is it still APC just with upped weapon system? I suppose the latter and IMHO in this case you can eat your cake and have it too. There are sill 9 dismounts, you have bettwr firepower. Still the doctrine is the same as for APC.
2) What is the ability of armed forces to pay for hardware and its ability to field the manpower? If you have a lot of manpower then IMHO it is better to have less expensive APC but field more units.
3) What is the predominant terarain to fight in? I am looking at it from closed hilly terrain with forests, villages, visibility usually 1 km. Here the 30 % more infantry is more IMHO more valuable than autocannon. Of course Stryker with autocannon would be the best but that goes ack to question 1).
4) And now purely gaming PoV. What is the price ratio between APC and IFV equipped unit. If I can have for the same amount of points two platoons of APC infantry vs one of IFV what is more cost effective. I suppose comined arms deployments so infantry with tanks. In that case I have more eyes on the ground to spot the enemy allowing tanks to eliminate it. (One side note - I don't play CM as the 3D does not suit me but I am Armored Brigaed player)
5) And last but not least and it just dawned on me as I read your comment. What exactly is flawed - vehicles or doctrine and organizational structure?
J.