I dunno about anyone else but to me TNG actually feels like Star Trek:
- follows a similar formula as the original.
- lots of space exploration, different planets and races
- takes place on the Enterprise
Plus:
- Patrick Stewart
- Data was such an amazing and memorable character; always aspiring to be more human.
- It introduced Q and The Borg
- spawned a few decent movies
To me, DS9 doesn't feel like Star Trek; always felt like a spinoff and doesn't appeal to my inner geek nearly as much.
TNG doesn't have much actual space exploration. It's very political. They're not discovering too many new races in TNG. in TOS, they face the dangers of space. Who knows what's going to happen? In TNG, they'll gather around their corny table and talk about it, and then if there's a menacing alien, they'll talk to it too. And then they'll find out it just wanted understanding after all.
What space exploration does TNG really have? Most of the aliens we encounter come aboard Enterprise are delegates, politicians, scientists, people of import.
Although TNG has aliens, it doesn't go into those aliens in any meaningful way. What alien race in TNG has the depth of what we learn about the Vulkans, Romulans, or even Klingons in TNG compared to TOS? None of them, besides Klingons. The one new big alien race TNG introduces are Ferengi and Borg, and Borg are given more detail outside of TNG and rarely show up. Ferengi are two-dimensional and act as caricatures. Cardassians and Bojurans, two races DS9 helped fill out, including Ferengi. What about the Q? What did the Q really add to TNG besides the occasional one shot great episode? What exactly do we know about the Q as a race rather than Q the standalone character? Based on TNG, barely anything.
Most episodes in TNG are on the Enterprise and Enterprise only. There's not much actual space exploration, not compared to TOS. It lacks the danger and excitement of TOS as well, while lacking the personal and in depth look at the various races that make up Trek like DS9.
TNG is a master of none.
What I enjoy from Trek the most Is the philosophy mixed with the aliens. I'm not sure how you don't get what you enjoy about Trek from DS9. The alien planets were only ever a backdrop for the stories that occur in Star Trek. It's the stories that matter, not the settings.
Star Trek is ultimately about multiculturalism and living with and accepting people different from us. No Star Trek embodies this trademark more than Deep Space Nine - a story about people who have to merely
deal with living with each other, giving multiculturalism its greatest test. The beauty of DS9 is the none of these people would be friends OUTSIDE of DS9, but DS9 brings them together to learn to appreciate and learn from each other through its pitfalls and setbacks. Is that not Roddenberry's ultimate goal with Star Trek?