I am about to start POS application development and I can not decide between Firebird and PostgreSQL.
(Firebird 3 or PostgreSQL 12)
As for functionality both DBMS have everything I need.
When it comes to Firebird I am bit concerned about reliability, on the other hand PostgreSQL installation is about 20 time larger (9MB vs 192MB).
So if anyone can share some thoughts, advice or experience it would be very much appreciated !