Also, brown doesn't match everything... try a black and white paint, brown doesn't match too well.
I love black, but that is just me :) will say, finding a black jump saddle my size is rather difficult.
Brown matches with everything!
Brown would be best because it is so much easier to find matching tack for a brown saddle then it is for a black saddle unless you ride dressage
definitely go with the brown. i find they look more professional
Just personal preference, but I find that unless if it's a dressage saddle, black tack looks tacky