I didn’t say follow their Minhagim. But you could be Mekabel their Torah, etc. When I say mekabel I mean learn from it as a way to explain your horizons, not necessarily change who you are. Regarding whose is the most right, Yavo Eliyahu….
But it’s known that several groups have a direct chain to the Geonim, who have a direct chain to the Amoraim. So maybe they are the most authentic.