Steve,

The blue-board - that has non-isolated inputs and I would not lose sleep over it being susceptible to electrical noise, resulting in spurious limit/estop triggers.

The green card actually looks quite good. I'm struggling on a Mac to look at it properly (the "trending" articles obscure the images on both Safari and Chrome), but it looks to provide isolated inputs... and ironically isolated outputs (I say that because just about all stepper drivers then have isolated inputs... you can have too-much isolation!). At this point, personally, I'd be trialing the green card. As earlier, you might need a second PSU - check the board silkscreen for. 12-24V... it's need no more than 500mA)