Well, I guess I'll answer
You must be wearing your watch HARD if you're scratching BTF crystal. Mine is still immaculate after 6 months. No hairlines, no nothing, in sunlight no scratches.
So my recommendation for you is to not switch your crystal out because Deep will pick up scratches easier.
Like I said earlier, any double AR coating will scratch if you're not gentle with your watch. It happens even on gen. That's the truth of the matter.
If you can wear your watch more gently then Deep is worth it. But if you wear it hard it'll scratch up after not even 3 months.