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The 3.0 board is setup for GRBL v0.8 and has no noise suppressing capacitors for the end switches. The 3.51 board is setup for GRBL v0.9 and comes with the noise suppressing capacitors installed although you have to solder all the other components. There is a pinout change between v0.8 and v0.9 so you need to know which version of GRBL you are running.
For Stepper drivers I tried some cheap chinese which seemed to have a prescaler but no microsteps, movement was correct but noisy. Then I changed to Pololu DRV8825 which improved the smoothness of the movements a lot.
With the heatsink I set them to 2.2A for my WANTAI 2.5A rated NEMA17 motors. That is a lot better than sharing one stepper for two Y motors on the G-Shield and only 20% less than the X-Controller on 2.8A motors. For me that is enough as I do mostly Balsawood.
On the older board I used NO switches with a 47uF capacitor just before the connector. That took away the noise.
