As a practical gun, the SAA is big, hard to conceal, hard to use (for most folks) and is for all practical purposes a six shot gun since reloading in a real gunfight would be nearly impossible. (I know about movie gun fights with those 72 shot revolvers that never need reloading, but I haven't found one yet.)
In a criminal trial, the type of gun probably won't matter much if at all, but in a civil case I can see the plaintiff's attorney slinging terms like "crazy cowboy" and "little kid playing cowboys and Indians" etc. And the newspapers would have a field day with "Wyatt Earp", and "Jesse James". A Model 10 just doesn't have that kind of aura.