Only if you establish a single metric by which all moralities may be judged. I may judge one morality as good for keeping poor people from consuming productive capital, and another as good for advancing the arts and sciences, and yet another as good for ecological sustainability. No single value system is universally superior, because there are always tradeoffs.
It's like asking "what is the best alignment in D&D?" Paladins will say lawful good is the best because their god likes it, but sneak thieves are more likely to espouse chaotic neutral, because it means they can pay their taxes with money cut from the collector's purse, then steal it again after the ledger is dry.
Or it's like asking "what martial art is best?" That depends on what you use it for. Exercise? Military? Police? Organized crime? Bar fights? Action films? MMA competition? Wushu exhibitions? Selling colored belts to suburban kids? A military system like Krav Maga is not going to work well in competition, because nobody can voluntarily fight if everyone in the league is currently dead, permanently disabled, or recovering from severe injuries. Likewise, a movie style like "Gymkata" or "Gunkata" is useless for any real-world application.
Besides that, people do adopt other moralities. It's where many of the cult followers and disciples come from. Does that mean it's superior, or just better for that specific person, at that time?