Here is a really simple answer.
The military trains in MOUT (Military Operations Urban Terrain) while similar to CQB (SWAT Tactics) it is different because In this scenario collateral damage is not as big of a worry as it would be in, say, downtown New York. So instead of using the doorway like the enemy expects, we put a SMAW rocket with a thermobaric warhead through the wall or use an AAV to punch through the wall. The only hard and fast rule in MOUT is that ANYTHING that works goes.
SWAT specialize in barricaded suspects, hostage situations, ect In America their weapons and munitions available really drive their tactics. I.E. can't use a SMAW to make a new doorway from a safe covered and concealed location or put a couple canister rounds from an Abrams into a crowd or living room.
SWAT tactics focus on moving slower, keeping friendly casualties to a minimum, and taking precise shots because they are accountable for every single round fired in a court of law whereas MOUT focuses on moving quickly, securing large areas, lots of troops involved, air to ground assets, and typically many more opposing forces than SWAT will ever face in a single encounter.
The Marine Corps does have a CQB school down in Chesapeake, Va that I have had the pleasure of attending and while there I learned the differences between MOUT and CQB.
MOUT focuses primarily on actions outside the buildings and clearing buildings are only a small part of the overall plan whereas CQB primarily focuses on tactics INSIDE the building and it is usually assumed that the environment for CQB is a semi-permissible one vice an outright hostile environment such as Fallujah, Ramadi, and Baghdad.
SO to answer your question I would have to say that it would really depend on the situation, mission, enemy, time, and terrain to give you a solid answer to your question. Also depends on who is defending the "objective" Is it RPG and HMG armed terrorists or some upset person that is holding someone hostage with a handgun?