The issue isn't so much which chip is better or worse, it's which mfgr LIES to you and MISLEADS you and sells you JUNK at a lower price before skipping on to the next sucker (after the time limit for negative feedback has expired) and which is HONEST and UPFRONT about the right chip for the job and sells you a QUALITY product at fair price, then supports it after the sales.
The TB6560 is a fine chip; if I were designing a 3D printer or a small engraver or drilling machine that was a complete system, I would probably use it. But it's not appropriate as part of a modular, homebuilt, CNC machine because of the power on sequence issue as noted. The TB6560 drivers from china are JUNK, /for your needs/ and for one other reason that affects the TB660 driver as well...
The TB6600 driver from china isn't going to work any better tan the TB6560 driver. Not because the chips is better or worse, but because BOTH were put together at minimal cost, by practically slave labor, by people who do NOT care about you.
The kits Luc and I sell are stocked with quality components. The design is solid. The PCB is good. And if you have problems, we make them right. I've fixed several drives that a customer assembled incorrectly. I don't complain, I just fix them and send them back. I do not have unhappy customers. Period. Why? Because I actually care. China can't compete with that.
James hosts the single best wiki page about steppers for CNC hobbyists on the net:
http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)