What ever one your skip, I suggest you take it next semester.
OptoElectronics is exciting because of the changes in LED technology that have taken place over the last 5 years. New colors, Higher outputs, and even Laser outputs.
Also the High switching speeds has pushed the network communications even higher.
This can be an exciting field but I am guessing they will only cover the basics if you are only taking 1 semester of it.
Embedded systems sounds like a microcontroller class. This class will focus on complete modules that have functions all their own and how you interface to them in larger designs or circuits.
My choice would be the Embedded systems first as Opto is moving so fast, next year there will be new things to learn so I’d rather let that technology grow as long as I can before I jumped in.
In the end I’d still want to take both.
-Mike