Just my opinion…
Although I’m assuming your main reasoning is for “blinding light,” you might consider how often you’ll actually use it for such, and the propensity for using it for other things more utilitarian.
I have the first gen SF E2D Def LED (currently experimenting with a LF head and tailcap). Although I like the idea of the bezel for certain things, it is sharp in the pocket. I don’t like the raised areas around the tail cap. Additionally, it’s not really dual fuel… unless you count the LiPo SF batteries at half the run time, or an aftermarket 16650 which will give you less output.
However, as an emergency light, I like having a lower lumen in cases such as if I’m stuck at night in the middle of nowhere and need to see where I’m walking, or something similar where I might need a few hours of minimalistic light… I don’t really camp, so reading a map or similar in the dark isn’t high on my priority list, but it’s another reason. Similarly, I like the two way pocket clips, as I’ve occasionally clipped my lights to the brim of my hat for hands free use.
I don’t own a Malkoff, but of the two you mentioned I would probably lean towards the BG if I had a secondary light for general utility. Similarly, if I needed something for longer term searching or identifying I’d probably go with the BG. If I was just going with one light, I’d probably lean towards the SF, but would probably carry it in a belt pouch… I would often keep my E2D Def in a vertical sunglass holder on the shoulder strap of my backpack when riding the motorcycle to different states. I did a lot of riding at night, as the days were spent visiting with family and friends.
As a side note, one time I had to pull over because my blinkers weren’t working properly. It was pretty dark, and I had to check the connection with the battery (LED turn signals). I would have hated to have 1000+ lumens shining back at me as I worked on the bike. The Malkoff’s 250 lumens might still be a little overpowering in that situation… although I’d probably prefer 15-35 lumens which isn’t offered by either mentioned model.