Both Ford and Chevy had narrow front axles in '97 (and before). Ford widened their's in '99, Chevy/Workhorse about the same timeframe.
While the wider track might offer some additional stability, there are too many variables involved to make a blanket statement. Weight distribution - correct alignment - track bar(s) - tires - shocks - etc. ALL affect stability and handling. If the Dolphin is in good condition with a floorplan you like and a price you can afford, don't let the front axle width be a deal-breaker.
I've got a wide-body 36' coach with a narrow axle. It looks goofy but it handles just fine for what it is.