Indeed, front suspension design is but one of the many factors determining a coaches ride and handling characteristics. By itself, it will not "transform" a poor riding/handling coach into a good one.
Some manufacturers known for high end coaches offered both (Foretravel comes to mind). Very hard to quantify differences here where it counts as all other aspects were the same.
Personally, I prefer a GOOD suspension on solid front axle for both ease of maintenance and good ride and handling qualities. Our current coach, a 2003 Alpine qualifies and was chosen with that being one of the prime reasons. But long WB/OL, 4 ride height valves, oversized 99 series Koni shocks, good weight distribution, etc are all factors in the equation. No single component was the "silver bullet".