I really loved "Heaven Sent," so I totally get it. I'm surprised that Season 4 did so well in that poll but I guess I'm not totally shocked. I guess that was at the height of Tennant's popularity and it seems like Donna just gets more popular with each passing year.
Some further thoughts on Season 7 vs. Season 9:
I think Season 7 works better as a unit. The Impossible Girl arc is interesting, if a bit contrived. And there is some nice build up to Amy & Rory's departure.
Season 9 doesn't have much of an arc at all. And the stuff with the confession dial & the hybrid just don't make any sense to me. Also, Clara is not used very well in Season 9 (apart from "The Zygon Inversion" & "Hell Bent"). We got a pretty complete sense of what she was up to both on & off the TARDIS in Seasons 7 & 8. In Season 9, she's more of a cypher and feels like she could be any companion.
On the other hand, if we're just counting the seasons in terms of overall individual episode quality, Season 9 wins that fight. Pitting their best episodes against each other, Season 9 has some heavy hitters on its side like "The Zygon Inversion" & "Heaven Sent." Season 7 can only muster up 2nd tier stars like "The Power of Three" & "Cold War." Pitting their worst episodes against each other... well... that's actually pretty painful. But putting "The Bells of Saint John" against "The Magician's Apprentice," I would probably give a slight edge to "The Magician's Apprentice." It's a little messy but it's not as irritating as the headache that "The Bells of Saint John" always gives me for some reason.
Some further thoughts on Season 7 vs. Season 9:
I think Season 7 works better as a unit. The Impossible Girl arc is interesting, if a bit contrived. And there is some nice build up to Amy & Rory's departure.
Season 9 doesn't have much of an arc at all. And the stuff with the confession dial & the hybrid just don't make any sense to me. Also, Clara is not used very well in Season 9 (apart from "The Zygon Inversion" & "Hell Bent"). We got a pretty complete sense of what she was up to both on & off the TARDIS in Seasons 7 & 8. In Season 9, she's more of a cypher and feels like she could be any companion.
On the other hand, if we're just counting the seasons in terms of overall individual episode quality, Season 9 wins that fight. Pitting their best episodes against each other, Season 9 has some heavy hitters on its side like "The Zygon Inversion" & "Heaven Sent." Season 7 can only muster up 2nd tier stars like "The Power of Three" & "Cold War." Pitting their worst episodes against each other... well... that's actually pretty painful. But putting "The Bells of Saint John" against "The Magician's Apprentice," I would probably give a slight edge to "The Magician's Apprentice." It's a little messy but it's not as irritating as the headache that "The Bells of Saint John" always gives me for some reason.