I have both a Bersa DA/SA .22 and an Astra Constable .22. I consider them essentially identical for the spaces they fill in my accumulation.
They seem equally reliable, equally accurate, both are fun for an afternoon of plinking. I got both of these because I couldn't afford a Walther PP or PPK in .22. After I got the Walthers, I found the Astra and Bersa were much more reliable and accurate, so the Walthers moved on. I now have a reliable and accurate PPK/S in .22, and can't bring myself to get rid of the earlier guns.
I'd recommend you get which ever you can find extra magazines for, and buy a bunch! These guns get better the more you shoot 'em, and you're gonna want at least four extra magazines to keep 'em warm.