APC is fastes, less amored and less equiped armored vehicle how normaly will go down by a LAT or a HAT in one hit.
MBT is slowy, better amored and better equiped vehicle how will able to take one hit of LAT but still beated by HAT.
the APC in my opnion is ideal for Anfibius assault situations, regular in florest e good in swaps.
the Main batlle tank is enxelent in Plains, Deserts and any open field because unless a aircraft destroy it the only thing that beat he there is a biguer MBT. also regular in florest.
but the ideia come's, the tank can be a lso used has a ''APC'', because of the troops that can seat in he boby to be transported, what means they will automatic go to the right place what means faster embarc and desenbarc, also it have faster ''retreat'' (i don't remenber how spell fall back in cars leguage) what will hapens like that
------------3-----2----1--TANK-----4-----5----6---------
after
------------3-----2----1-------------4-----5----6----------
-------------------------------------------------------------
---------------------------tank (convering they)----------
while the APC have a door what means that take time to be open, other wise since APCs are anfibius it's worthy in afibius operations, what means they will need the door but thincking about it, then embarc and desebarc will be slower and dificult in crisis situation like aircraft bombing it.
-------------------------APC-----------------
after
-------------------------APC-----------------
----------------------1--------2--------------
-------------------3--------------4-----------
---------------5-----------------------6------
again after
-------------------1--- APC---2--------------
----------------3------------------4----------
------------5--------------------------6------
to be finaly
---------5----3----1---APC--2----4----6----
and then the APC retreat to give convering fire what means a significant ammount of time. hoever since it have more space inside it's easyr to carry more ammor and heavy weopows has well, but this don't give much advantage to he be fithing agaist a MBT since their infantry may have less firepower but he got alot more that a APC. also a tank can still have a ammo bag in it's back just like the old days cars. what don't exaclt say they can't carry ammo for infantry. of course if it blow ups it will give a undesired dead, but dead is dead so i rather aprove it if it's going to increse surving chances, after all the MBT tank alerdy is weak in back atack, a bit more of armor there will not hurts. how kwons a amored ammo box.
so i prefer to Use main batlle tanks has improvised APC has well tanks, because in my opnion it is better in real life. after all infantry is cheap so why don't make then go in the MBT? also MBT have a secondary gunner what means more perception and firepower in jungle, perseption is highty required in such zones. hoever both must ALWAYS BEING ESCORTED and escort AA vehicles, since aircraft can fuck any tipe of armor alot.
conclusion
so what can i say, the APC is frong, and the MBT is Sneak ( i will told a lion but that will shown the APC to weak compared to it, and since some frongs have more poison that sneaks i can say this poison is the TOW if there is water deploy APCs if there are plains deploy MBT) and the APC is a current good frontliner unit. even tough you still ablle to shoot the boys in the top, it would happen anyway to the APCs guys 2, and since APCs are quite unarmored compared to a MBT i really see this like a good sacrifise, after all infantry take casualtys to ANYTHING! and ANYWHERE!.
hey i kwon it's a movie, but it give's a ideia about what i talking about. i kwon the end is a bit desapoiting to my arguments but... anyway
enjoy.YouTube - Panzergrenadier X T-34
B4TM4N 
