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"Best" is an opinionated, personal evaluation. Best for someone else is generally not the best for you.
No tablet is good in full sun, period. None are "best", though a few might be considered "less bad" by some users. I old Dell Venue8 Pro does reasonably well in open shade, but not so good to unreadable in brighter situations.
A Windows 10 tablet will be the "best" at handling the widest range of formats, though Android and iOS tablets will handle all modern true ebook formats and most document formats well. In all cases, handling a wide range of formats well requires installing more than one viewing/reading app. No single app on any OS will be the best for each of a wide range of formats.
You'll find that a number of members here even go the the extreme of using different devices for different formats in order to get their choice of "the best experience". I use a Win10 tablet for most of my reading, but also use a Kindle (eInk, no frontlight) for times when it is the better choice because it is lighter, is very readable even in full sunlight, has a massively longer run time per charge (we lost power for a week during Irma this Summer), or some combination of these.
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