I model in N scale and have only one Blair Line kit on my layout. The vast majority of structures on the layout (14) are from American Model Builders, LaserKit.
The Blair Line products are good, but for my money, if you can get the same or a similar structure from AMB, go with the AMB.
I've found the parts fit better and the finished structure looks better.
Just my opinion.
This structure is from Blair Line.

It didn't strike me till after assembly, but there's nothing to support that massive chimney. If you notice, the wall below it has a large window and a door. It's on the layout, but if I find a replacement, it's gone.
I know this is apples and oranges, but the building below are from AMB.



The fit of the parts is just better with AMB.