Web Player for php/ajax game

Hi.
I have game in (?) php with ajax. If I use unity and web player to replace that was be better than php and ajax or same or worse?

Though I am sure there are alot of things that you can do with php/ajax, you probably will not be able to create true 3d games in it. That coupled with Unity can act pretty much like ajax means that you can have a php/Unity game which could be far superior to the text/image based game that you would get from ajax.

I thought about 2d game, but I can do this game in 3d with mysql (for player position, level, statistic etc.) ?