I’m not an expert and have only ever built OnStep with the Fysect board, but I must say I’m very happy with it. I picked it pretty much for the same reasons you mentioned, something that just works with minimal to no soldering. 

The issues I had while flashing were only because I didn’t fully understand what exactly I was doing, but after that, I’ve flashed it several times, changing gear ratios, adding wifi and a focuser. All without problems.