Since this list is of older pistols, I'll assume the PT22 to be an older metal frame version. However, a tip up barrel, no extractor, double action only Taurus PT22 would not be my choice over the other two single action/double action pistols unless you just had to have the smallest of the three.
I have a Beretta 21 that the PT22 mimics, with the Beretta having an SA/DA trigger.
I also have the current version of the Bersa in .22LR and it is a better gun than my 21 at everything except being small.
I have no experience with the Astra. I'd like to own one, but wouldn't shoot it much if parts availability is an issue.
So, put me down for the Bersa.