I haven't tried KY but I don't recommend Astroglide. The lubes available in your regular grocery store or drug store might not be the best ones out there.
the only product my fiance and i will use is 'wet platinum', it's a 100% Pure Silicone Formula does not break down in water so it may be used in the shower or hot tub, also
stays silky longer than any water-based body glide and never dries
We started with KY many years ago, and switched to AstroGlide. It works better for us, and is cheaper at places than KY. Now we're starting to get into higher-end lubes, but when in doubt, AstroGlide it is.
KY burns for me every time. I've never tried Astroglide. I've been using ID or Jo for years now. I recently ordered Yes which I'm really excited to try.