Quoted from Shastings:Just after opinions as to whether Medusa and Embryon are worth the same in a trade (assuming same condition) or is there a +/- cash element. 1,000 less Embryons made but Medusa seems to be higher rated?
I would consider them pretty equal. Embryon is a little harder to find and both are hard to get in good condition. Both are very unique games with a lot to do.