In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Electronegativity wrote:

Hi Tgd8934, did your mother name you that, or was it assigned when you were assimilated by the Borg?

Seriously though, the answer to your question is that the Basic Stamp is bigger, more expensive, and a LOT easier to use.

I got started with a BS2, and within hours of getting it out of the box had readings from a flexiforce sensor displaying on an LED display.  Not because of any great skill on my part, but rather because I downloaded code from Parallax and pasted it together.  

The SX has a steeper learning curve, but is cheaper and more versatile. 
For example, you can run the SX off 3.3 or even 2.5 volt power supplies, which helps save battery life on portable applications. (The SX key still needs 5V to program it though).

My current project is a Simon Sez game that is only 1'' wide by 1.5" long and less than 1/2" thick.
It's based on the SX28 and runs off a single CR2403 coin battery.

The entire game will be about the size of a BS2.

A number of people who frequent this forum sell products based on the SX chip.
For most of them I would bet that the price difference between SX an BS is make or break.

The Basic Stamp is ideal for educational purposes, or for controlling large expensive objects.
If you are building a $1000 robot then the extra cost of The BS2 will be offset by the value of the pre-written code you can get from Parallax for things like driving servomotors or processing video input.

Good luck either way!
-Electronegativity

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