The 2.5-inch standard
And that would be a good decision. The new Vertex 4 now uses the second generation (Everest 2) of the controller and offered great performance in my testing.
It's the first SSD I've seen that took just a second to be formatted and was immediately recognized by the system when used as a secondary drive.
On top of that, it offers very fast performance, not the fastest but very close to that. It also comes included with a drive bay converter to easily fit in a desktop computer.
The best thing about the new drive is the pricing. It comes in three capacities including 512GB, 256GB, and 128GB, which are priced at $700, $350, and $180, respectively, making the cost per gigabyte to be just around $1.30 to $1.40, comparatively affordable. Note that these are suggested prices, meaning the street prices will likely be lower.
For more information on how the new drive stacks up against others, check out the