Hello,
First of all, avoid the Leitz BA Trinovids, which did not have phase coating. As the Leica BN glasses are later than the Leica BA glasses, they are a better choice unless you need their focussing range, as they probably have better coating. The BN binoculars were made to focus closer, so the BA glasses go farther past infinity.
I could not get along with the 10x50BN, as it was hard to hold steady. The Leica 8x50BA struck me as just too heavy and I did not need the wider aperture for my bird watching. The Leica BA 7x42 is outclassed by the Zeiss ClassiC 7x42. Having written the above, I get along very well with the Leica 12x50 BA, on a monopod, for astronomy and shore viewing, even if it does not have dielectric mirrors.
My best experience was with the 8x32BN.
Stay safe,
Arthur