BoB, as others have said, is in a league of its own. Just top, top quality television. It's up there with GOAT mini-series, like Chernobyl. To see what these guys went through, it's just remarkable stuff. In many respects it feels like an accurate dramatisation of several episodes of the legendary World at War series narrated by Laurence Olivier. Still the gold standard of WW2 documentaries. That's how good BoB is.
The Pacific, while well worth the watch, is several tiers below BoB. It doesn't make it anywhere near my list of all time great series. The writing, acting, and story-telling perspective are all of a lower quality. Of course, it is all comparative, because this is in comparison to BoB. As for Masters of the Air, I found that to be a million miles off both. The air scenes were largely incredibly well filmed, but that's about all I have to say about that series that's positive. I thought that was one of the biggest TV let downs of the year. Incredibly mediocre series. Which is absolutely no shade on the real life story, and is purely aimed at the TV dramatisation.