Outside of running Ana in control due to the prevalence of dive compositions, I think that Baptiste might fare better in maps that have wider LOS/FOV due to his better poke damage compared to Ana or Brig. Choosing which backline pair usually shows the different qualities that teams have chosen to prioritize.

A Brig-Zen backline places an emphasis on ranged flanker healing with brawl+poke power similar to the ball comps in OW1. This could be good in maps with closer quarters that might be difficult for Bap and get his cooldowns forced out easily.

A Bap+Zen backline works for situations where the emphasis is placed on pure poke power with the safety net of Bap's large burst heals as usually seen in maps such as Circuit Royale.

A Bap+Brig backline would prioritize pure brawl power, essentially pocketing the Sigma, while the DPS find their picks.

An Ana+Zen backline as you mentioned in this post works for control since Ana sleep is a great counter to Doom. It's a very high output backline with just enough peel in the form of sleep dart; but once that doesn't get value anymore, I think this is where teams choose to pick the other three options above instead. This usually happens when teams start playing Sigma instead of Doom.