The Segger people are smart and do many things right. The JLINK can be used on so many devices that truly one pod may be all you ever need. The JLINK-EDU is a no brainer if you are a hobbyist, and if you are commercial, then the cost of a regular unit at $300+ is not too bad either.
I do a lot of software prototyping on the ST-Nucleo, and since they have the ST-LINK/V2 onboard, that's what I use there, but otherwise, the JLINK comes out. Much faster too. (I use our own debugger so it does not matter what pod sits underneath).