Valencia, I've read, requires a warm hot climate for good flavor.
Don't get me wrong, a good Valencia has the best flavor of any orange, but several growers in cooler climates have stated that their Navels taste better (maybe just sweeter?). I personally would still try to grow Valencias (maybe just stubbornness on my part).
Also some citrus varieties take longer before the fruits start developing good flavor. You can't really judge the flavor of a variety from how the fruits taste in the first few years.
And of course fruits grown yourself, just picked from the tree, always taste better.
Page, to me, has a tartness greater than Minneola tangelo, so probably good for juicing. (But that doesn't mean it's not plenty sweet). I can definitely pick up on some of the Duncan grapefruit flavor, just as I can in Minneola. The fragrance of Page though really reminds me of pine needles (not at all in a bad way).