I need help in the choice of a DBMS to use in a spatial application (considering geometry data, and not geography).
About you, which is better between MySQL and PostgreSQL?
It depends on what you really wanna do, MySQL is user-friendly with all the UI tools it has, now you are able to model and create databases very fast with the mysql workbench. In terms of performance, MySQL is good, but I think Postegres has a better license and even when it has no a lot of tools, it provides the required functionality.
You can take a look at this: http://www.wikivs.com/wiki/MySQL_vs_PostgreSQL
I recommend you this video as well:
http://www.youtube.com/watch?v=1PoFIohBSM4
Best regards my friend.