In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

The Basic Stamp II (BS2) PBASIC is a bit easier to set up and learn than using SX/B (SX Basic). Some times I will develop something on a BS2 and then port It over to the SX28 or SX48 or SX52. You may want to consider getting a Professional Development Board which supports both BS2 and SX28 micro-controllers. It has been great for me!
 

The Basic Stamp II cost most per chip being $50 to $80 depending on model and it is great for simply projects that you want to get developed faster. However, the SX chips need either an SX-Blitz or SX-KEY (~$30-$50) ONE TIME PURCHASE to program the SX chips BUT the chips are less than $3 each. The SX chips also allows for programming in either SX/B or Assembly language but the BS2 programs only in PBASIC. It is made for easier development. Each has pros and cons. Once you get better at SX/B then the choice is obvious but for the absolute begineer I would recommend starting with the BS2 or better yet BS2px (3 times faster I beleive than a BS2 - and more EEPROM space). The BS2 also has less variable space to work with. The SX48 and SX52 is best supported by their SX48 and SX52 $10 protoboards - but you will still need to by either a 1 time purchase SX-Blitz (no debuging but cheaper) or SX-KEY (adds nice debuging features) to program them. The SX48 and SX52 has much more variable space, RAM and most importantly I/O lines than the SX28 and BS2. The SX28 like the BS2 are DIP based so they can be used on solderless breadboards as well. 

 

Bottom line is that the BS2 is most expensive overall but somewhat easier to pick up and learn. SX/B is not hard to learn either. 

 

I hope this answers your concerns and paints a better picture of the differences. I use all of them.

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