A long time ago I was warned about entrance panel GFCI circuit breakers. Don't recall the specific technical reason, but having to go into the EP to replace is a major pain.
Since then I've wired several barns. The first, I used individual GFCI outlets, only needed 5. 3 covered outlets for 2 stalls each (fans), one was a service receptacle for the aisleway and the last covered the tack room. That was nearly 30 years ago and I've replaced one. Very, very occasionally, one or 'tother will trip without load. Humidity?
The 2 much larger builds used a separate GCFI (wall mounted near the breaker panel in one, in the aisleway right by the light switches in the other) to handle all the stall receptacles. There were enough of those I didn't need service receptacles. [Each stall had it's own dedicated receptacle] Come to think of it, the receptacles in the tack room/water heater/water tank rooms had individual GFCI outlets-one each.