I have experience with both. I wish the Bushy had illumination (the v2 will, I am told). That said, I;d do the NF, unless FFP is a deal breaker. NF scopes are dead nutz and are almost bullet-proof, they are simply great scopes. Glass-wise, in full light, it's close to a tie. in low light, the Bushy fades - and no illumination makes it all but useless in very low light.
Add the SS to the mix, and it gets interesting. The SS is FFP, mil turret and reticle, and is illuminated. I wasn't really impressed with the sight picture of the 22 5-20 at 20X, but I am seldom impressed with >20X optics at their max range, head position is just too damned picky.
If low light shots are possible, scratch out the Bushy. Between the NF and SS:
Glass is almost indistinguishable, both are about equally good.
SS is mil/mil, NF has some choices on both reticles and turrets.
Illumination system in the SS is far better.
I find the NF slightly more forgiving of head position at the top end than is the SS.
Both have, for me, tracked dead on.
I hate the turning ocular of the NF.
For the money, it is hard to beat the SS. I had to jump to a $3,000 20X before I found one liked appreciably more.