I can only assume you've made a typo here, and that you meant to type 'spintronics'. I can't say I know much about the topic myself, but spintronics essentially involves the 'merging' of both the magnetic and conventional electronic properties of electrons. This has potential for bridging the gap between computer storage (magnetic) and logic (electronic).

So to answer your original querry (incomphensively), spintronics should be more versatile than nano-electronics, which is essentially small scale electronics. Conventional electronics will eventually reach a stage where it is impossible to go smaller (dictated by fabrication techniques, and the fact that materials properties change considerably at very small cluster sizes). At this point, spintronics should take over.

The following URL may be useful as a primer
http://physicsweb.org/article/world/15/4/10

Good luck