Are there caulk/sealants that work better than others for implementing "air tight" drywall. And what "family" if you will performs better i.e. polyurethane, latex, silicone, solvent based, acrylic etc. Thank you

A common choice is tremco acoustic sealant. I hate that stuff. It's messy and hard to clean up, and it stinks not only during application but for months afterwards.

What I like is Contega HF, which does emit some vapors, but it's ethanol, which is pretty safe (as long as you don't eat a whole tube of the stuff and then drive home).

I'd use gaskets and also read this. If you need to seal two flat surfaces, consider Tremco Dymonic FC (which is strong enough to glue them together and eliminate problems with the gap opening up). In other cases, preventing the movement isn't possible and you want the movement capability (ASTM C920 Class) of a good silicon.

IMO, sealants that stay soft will just get pushed out of a joint as it contracts/expands.

So airtight drywall is dead? If so I have NEVER seen a builder using the technique. And until recently I have never seen airtight electrical boxes at the Menard's, Home Depot or Lowe's. And the shelf space allocated to the item is very small which is indicative to its practice. My thought is to go ahead and seal the drywall as an added protection. I would think that even interior air membranes would loose their effectiveness as women of the household hang pictures or the men mount their trophy deer/fish etc.

airtight drywall is an excellent technique. What has happened since Joe Lstiburek developed the airtight drywall technique is that builders and others have found better ways to air seal the house long before the drywall goes up.

Drywall, because it is rigid, is move effected by the wood movement (thermal, moisture, loads) then a flexible membrane. There is very few 30 year old houses that don't have drywall cracks.

More discussion of air sealing options, especially the interior side, would be interesting. For example, MemBrain vs putting taped OSB on one side of the wall and taped rigid foam on the other (could be the interior or exterior side). Putting OSB and rigid foam tight together on the exterior (common around here) makes little sense to me - that wastes a good alternate side air barrier.

There seems to be good evidence that flexibly taped rigid surfaces outperform unsupported films (eg, MemBrain, Tyvek). Even when staples aren't used.

"Putting OSB and rigid foam tight together on the exterior (common around here) makes little sense to me - that wastes a good alternate side air barrier. "
Probably because the are looking to the OSB as a structural component and the insulation as a thermal barrier.
Where is "around here?"

Clicking on "jonr" shows MI. OSB on the interior and rigid foam on the exterior provides a structural component and a thermal barrier. As does OSB on the exterior and rigid foam on the interior. So again - assuming that one values air barriers on both sides (IMO, one should), what is the point in putting both OSB and foam on the same side of a wall?

Yes, but there is a few degrees of Latitude (and climate) between the UP and Detroit.

Builders simply think about framing the wall and so they put the osb where they always do. Then they think about upsizing it or maybe meeting some code and they add the foam on the outside. The beauty of it is that they don't have to do anything different with their trades. Once the wall is standing their electricians and plumbers, insulators and drywallers all continue on as they always have.
That makes cents to them even if it is not the most value from an efficiency point of view.

However, putting the two rigid pieces side by side does have an advantage in that as they probably don't tape any joints, they still get a reasonable air seal.

The airtight drywall approach forms an air barrier connecting the interior finish of drywall and other building materials to form a continuous barrier that protects the interior of the structure. Any construction company like http://unitedwaterrestoration.com/contact/tampa-office/ will prefer to usage this. It could easily be adapted to fit most construction schedules.