I wish to upgrade my standard 3Nm steppers with something better, closed loop. Cant decide between these two:

This one is very powerful, 12 Nm and cheaper, only 2 phase
http://www.aliexpress.com/item/Close...279180317.html


On the other hand, this one have less power but its 3 phase, which I don't know for sure if its better or not:
http://www.aliexpress.com/store/prod...511732199.html

My cnc its almost exclusively used to drill pcbs and depanelize (not routing) so im mostly interested in rapids an precision (6000+ drills on a single panel its a common thing in here)

I live in Argentina, so there aren't much options to choose from, these two are within my reach, but any other recomendations will be welcome for sure