I have the Pentax DCF-SPs in 8X43

I chose 8X over 10X for a variety of reasons:

8X is always brighter than 10X for any objective size because the exit pupil (the width of light exiting from the ocular lens) is bigger. Brighter for me is better for hunting in the woods.

Field of view is greater for 8X over 10X

If I hunted in open country out West I might choose 10X, but I feel that the brighter image with a wider FOV is a better fit for me.