I found the beyer to be very inaccurate. All the others seem to be quite accurate. Then again it’s only a guide as 20 min latter your BGL could be sky rocketing up or down so plus or minus 7mmol/l.
All have their advantages and disadvantages
The strips that come in the cylinders are more convenient as less waste to clean up, but they rattle.
Some have a near painless pricker, but are more expensive (for those of us whom live in countries that do not have universal health cover) to replace the lancet.
Some are smaller, some allow for computer downloads and the list goes on.