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Hi Adrian,
In an F5 scope you may or may not find the slight field curvature of the 14mm Pentax XW tolerable. If you use a paracorr it flattens the field beautifully but I don't think you have a paracorr? At the 14mm focal length you may find the 14mm Delos a safer bet if you don't have a paracorr.
I haven't spent very much time with the 6mm DELOS at this stage, as weather has been really bad here for several weeks. However, my one night to date using all the 6mm eyepieces subject to my review and also the 7mm Pentax XW is that of the two I prefer the 7mm Pentax XW. It is a bit more comfortable, easier to hold the exit pupil and is better corrected at the EOF in a fast newtonian. The differences are subtle but of the two I prefer the 7mm Pentax XW. The DELOS is very good and I will definately be keeping it, but you asked "which one".
When you have used that 10mm Pentax XW 500 times not 5, you will really get to appreciate what a good eyepiece it is. It just keeps growing on you. The 7mm is every bit as good as the 10mm. The 14mm is excellent on axis but not quite the equal of the 5mm, 7mm and 10mm at the EOF if you don't use a paracorr.
Cheers,
John B
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