Quote: "Blitz is better if you are used to languages like Visual Basic"
Apart from the fact it's nothing at all like VB?
Quote: "Blitz3D makes it better than DBPro in the fact that the number of whatever you want is limited to how much your system memory can hold!"
DBPro is limited to how much your system memory can hold as well.
Quote: "Plus, object-oriented programming (OOP) is more flexible in Blitz than in DBPro"
Blitz/3D does not have a single true object orientated command in it. Only Blitz Max does.
Depending on what you want to make, there are several reasons to use Blitz over DBPro, but those aren't any of them and are plain wrong.
If you'd said something like "blitz has much lower system requirements, so games made in it will work on older/slower PCs with less hassle" then that would have been a start.
A great many people think they are thinking when they are really rearranging their prejudices.