Can you bring other similar examples to prove this?
For Ventress, or in general?
In regards to Ventress VS Savage, from my interpretation at least, that Savage was winning due to his sheer physical might than skill. Savage's brute force and endurance was the more relevant factor as compared to Ventress' superior speed, which was why he had the upper hand. So whether Savage beats Ventress in skill, I remain uncertain. But Maul is definitely more skilled than Ventress.
It's the same case here, though. Maul's brute force and endurance are going to be similarly problematic for Ventress, and Ventress doesn't boast speed advantages over him either. And he is more skilled, as you said.