IMO, the BLR is overpriced for what it is - like most things Browning brands. The original 99 (maybe not the cheapened C model) would be a much more expensive rifle to produce today than a BLR. The 99 is definitely a more robust firearm despite the tendency to get cracked buttstocks behind the tang. That said, you usually see the cracks on late 99's because after WW2 the workmanship went down hill over time and the stocks were not properly relieved at the tang.
If you can find a rotary-mag 99, pre-1950, in a calibre you like and in nice shape, it's a hard rifle to hate. They can look a little odd at first, but the BLR is also not a great lever gun in the looks department. Come to think of it, none of the modern ammo spire-point lever guns look great compared to a nice Marlin or Winchester, so let's call it a tie?
I'd be comfortable with either a 99 or BLR in the bush, but I would never pay a $300+ premium for a BLR over a 99. Not worth the extra dough by any stretch.
If I had to choose (and I did), I would pick an early 99EG in a calibre I like with a Stith mounted low-power scope (like a 1-5x20 or a fixed 2.5 or 2.75X). In a 99, the Stith mount is perfect - lowest scope mount you will ever see, virtually eliminating any parallax error. Not so with the BLR.
I'm also particular about aluminum-receivered lever guns. Not a fan of them at all. If I ever got a BLR that I'd like enough to keep over a 99, it would need to be a steel one.