I am considering purchasing a standalone SEGGER J-Link Plus to develop my solution using a Silicon Labs Wireless MCU, but I see that your Wireless Starter Kit (WSTK) includes an on-board J-Link debugger that can be used to target an external target device (instead of the MCU mounted on the WSTK). What is the difference between these two J-Link variants?
Both options are highly capable solutions, and we've had many customers using one or the other successfully bring to market wireless projects. There are some differences however that may help inform your decisions as you establish your development platform:
Note: SWO is supported - using either J-Link option - within Simplicity Studio. The IDE comparison page at https://www.segger.com/jlink-ide-integration.html currently states that Simplicity Studio lacks this support - this is inaccurate and will be corrected soon.