There is very little change between the original Vertex 3 and the new Vertex 3.20, as the controller remains as an SF-2281 and the rated speeds match, the only real difference is in the new 20nm NAND.  In a way [H]ard|OCP was disappointed that OCZ did not reduce the size of the Vertex to fit in mobile devices as the new NAND is very power efficient and would be welcomed more by mobile users than desktop users.  As far as performance per dollar it is still the Samsung 840 which remains on top but OCZ has a solid contender.

"OCZ releases the Vertex 3.20 240GB SSD as part of the continued restructuring of its product lines. With 20nm NAND and a LSI SandForce SF-2281 controller the Vertex 3.20 SSD is geared for budget conscious buyers, and today we test it with the other top value-oriented SSDs."

Here are some more Storage reviews from around the web:

Storage