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Hi,
I think the 7mm will be a better focal length for your needs.
In comparing the 7mm Pentax XW and the 7.5mm Takahashi I can offer the following. Optically on axis there isn't a lot between them. Maybe a slight edge to the 7mm Pentax XW but it is pretty close. The 7mm XW is slightly cooler (whites are whiter) in its colour tone, which I prefer. The FOV of the Takahashi is significantly narrower and the eye relief is a lot tighter. If you prefer longer eye relief you won't like the Tak.
Of the two, I would be buying the 7mm Pentax XW each and every time, if the additional cost isn't a serious concern.
Cheers,
John B
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