When DS9 first started, I checked it out. It felt like a weak spin-off from TNG, which it was, and TNG was also still on the air, so I gave up on it. My understanding is that DS9 eventually found its feet and is now regarded quite highly, and I hope to someday get around to watching it all.
When Voyager started, it was the only Star Trek, and it was new. It was exciting, with the promise of new adventures in the fare quadrant and all that. I somehow watched all seven seasons of Voyager in original broadcast, even though sometimes it seemed like I was disappointed at least as often as I was impressed.
Voyager's first nine were better than DS9's first nine.