I actually read that bit myself but I can't quite see that on pro/con basis. Add on top of that that eZ-FET is not actually a MSP debugger so it may have other advantages/downsides. I guess I'd get best result if I use the MSP-FET as it connects directly to the MCU and the USB connection goes through another microcontroller on-board which has to add overhead. I found something on slau320x section 1.2.1.1 http://www.ti.com/lit/ug/slau320x/slau320x.pdf That gives you a simple pro/con table. 2-wire Spy-BI-Wire is slower but does not require any I/O pins as the pins are dedicated test pins. Of course you could see this as not having another two I/O pins.. JTAG is faster and has additional features which you mentioned but you're sacrificing 4 I/O pins.
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