For an optical telescope, the range of magnification that is desired will effect what ratio will be better. Eyepiece sizes tend to be in the range, 10mm to about 40mm. Without special design, like Naglers, the eye relief gets too short with eyepiece in the short focal lengths. When going beyond 40-50mm, the eye relief is too far away to maintain good eye position. Now we add the factor that the brightness of the object can be controlled by the F ratio.
Bright objects can tolerate more magnification before too much light is lost.
Now, we look at viewing faint fuzzies. Most of these things require that there be a minimum light lost to get the best view. Lower F ratios work best here. Magnifications don't tend to be as high because in low contrast, much would be lost. There is a practical limit on the lower side of magnification for viewing.