I would say permanently keep some form of horizontal rowing if you're not starting to train manna.
If you're going to rotate movements thoguh it's fine to do it with A/B workouts or whatever.... I prefer to do it after every cycle (generally 4-6 weeks or so.. with a deload).
It really depends a lot on your goals though. If you're going specific towards some goals then you likely won't want an A/B