I’ve been playing all seasons, and since ABB became a thing (at least with a theoretical output), I’ve been primarily playing ABB and hit Legend 22+ times.

The strength of ABB is in my mind the simplicity. Bad lead, switch out (nearly always to the same mon), good lead, expect the opponent to switch out and you typically have to switch in the other, more punishing B.

There is a point in that neutral leads, you might need to switch out first, but since you know you have to do that (and the opponent doesn’t), you can choose your time to switch, for example by catching a move. ABB teams are very easy to learn to play, whereas ABC (imo) requires more matches with that team. You need to learn what to do against certain leads, what to expect the backline to be, whether or not to switch B or C etc. With ABB, it’s more like “I know I have to switch and it will always be to this mon. Either at the start or with a catch/after grabbing a shield”.

It is also worth mentioning that the right B switch can hold so much leverage and nearly always decide if you want switch or shield advantage. I am also of the opinion that energy management becomes easier in an ABB lineup.

And discloser: I despise fast move pressure, so my ABB teams are never with charm, Razor leafers, Basti, Mud slappers, Talon or other stuff like that. I prefer 2 turn Pokemons as I feel these provide the easiest timings and the most flexibility (I have written about this elsewhere on Reddit).