M22 or re stamped or counter exchange

[Unreal]

I would never use a restamp, as that would call into question whether anything else is restamped. A CT, (Chevrolet Transmission- what you are calling Counter Exchange) only adds value when coupled with documentation that it was a replacement for YOUR car. Otherwise it is just another transmission.
The only way any transmission adds value, is if your existing one needs rebuild, and you repair it or replace it.
If your non-original transmission is beyond repair, or if repair cost exceeds replacement cost, I'd look for a date-correct replacement first, and a CT second. But, in my opinion, none adds value.
If you can't sleep because you hate your current M22, then do whatever allows you to get some sleep. Otherwise, any replacement transmission will add cost without adding any value.