ACCESS DB, and MySQL which one better to handle database driven webpage

[Colin TMC]

Can anybody help with the question about which one is the best to handle database 
driven webpage,  Since, we are running on ACCESS DB, and MS SQL for a long time, but, 
We just have our new Lynex server it is running MySQL, my question is:

1) What's the different between MDB and MySQL. I mean the string of code?
2) Is it worth to have this upgrade?

Thanks for the time