Factually, a synthetic reed is a copy of a cane reed. In order for a copy to be made to sound like a cane reed, it should play the same. There are two companies manufacturing reasonably acceptable synthetics” Forestone “and “Legere.”
The Forestone process is a complete process, the reed is finished , ready for playing, it being a molded process, but Forestone is able to make the tip flexibly thin as an end process.
Legere is also a molded process, howeer the concluding step is the cutting of the tip of the reed with an excellent diamond quality tool. Two Legere reeds will each play slightly differenly. Two Forsetone reeds will be much more similarly, one to the other ,because of the complete process of the manufacture.
I was given many of each, free . Big deal. The Legeres have so many (seemngly mind boggling) cuts. That is like cane. We are attempting to limit the variables, why make multiple slightly different copies?
Forestone are much more consistent because the process is complete.
After that, it is all a matter of sales pitch, price and opinion.