The first difference between the Ovation 56 EX and the Rcom 50 Max and Pro is the egg capacity. The Ovation 56 holds more eggs; up to 56 hen-sized eggs or equivalent. The Rcom 50 Max and Pro models can hold up to 50 hen-sized eggs, or equivalent.
The Ovation 56 EX, the Rcom 50 Max and the Rcom 50 Pro all have a humidity display and automatic humidity control. But, the type of control is different as the Ovation uses a pumping system whereas the Rcom 50 Max and Pro both use a heated water humidification unit instead, giving them more precise control.
Finally, the Rcom 50 Pro has a ‘species selector’ feature and specific settings for egg-turning; both of which are unavailable on the Ovation 56 EX.