One of the pitches for the original design of ds9 had the full rings like this. Rick Berman asked to have the top and bottom of the rings removed, and the result was ds9. Perhaps I've just grown used to it, but I prefer the TV version. I've always found it to be a visually appealing design. The only other space station design I've seen that I found visually appealing was the space dock from TSFS. And perhaps the Death Star.