I started out using the Kadee under-the-track magnets and they worked very well and can be easily hidden with track ballast. The downside with them is they are a little too thick to match the WS roadbed. I had to chisel out about 1/8" of sub roadbed to get a good fit. Between the rail Kadee magnets are designed for code100 and will not sit down far enough for code 83 (as per Kadee). I had to cut rails and float the magnets in the glue using a jig...which really sucked when you consider the drying time of the glue. For magnets, the under-the-track type are the best...definitely the strongest.
The magnets are great for hard to reach places, but can be a pain when doing switching operations in a yard by causing uncoupling of cars anytime you slow/stop over them. I know...that's the way they are suppose to work, but in yard operations, you are constantly backing up, stopping, changing direction without the need to uncouple.
Although still installed, I only use those magnets in hard to reach areas and prefer bamboo skewers in all other places. I like to take a sharp knife and put sides on the skewer tip if needed. This gives it an edge to help open the couplers.