Since a lot of people said they were interested in seeing something like this, I've thrown together a few calculations for you guys! Let me know if there's anything not included here you'd be interested in knowing about and I can probably calculate it for you :D
(That's a difference of 1 vote on each of those)
The average number of votes per poll was 400, with the highest turnout being Prismarine vs. Dandelion which got 883! Though Redstone Wire vs. Potted Blue Orchid, Flowering Azalea vs. Lava, and Sand vs. Potted Flowering Azalea also all got 800+ votes each.
Most popular block families:
Heads/Skulls (7 wins vs. 1 loss - 87.5% win rate)
Candles (14 wins vs. 4 losses - 77.8% win rate)
Ores/Gems/Minerals (26 wins vs. 9 losses - 74.3% win rate
Least popular block families:
Glass (5 wins vs. 63 losses - 7.4% win rate)
Banners (0 wins vs. 10 losses - 0.0% win rate)
The three most popular wood types were Cherry, Warped, and Dark Oak, and the three least popular were Acacia, Jungle, and Birch.
Cherry had 15 wins and 4 losses (a 78.9% win rate), and Acacia had 3 wins and 15 losses (a 16.7% win rate).
The three most popular dye colours were Pink, White, and Black, and the three least popular were Brown, Orange, and Magenta.
Pink-dyed blocks had 7 wins and 7 losses (a 50.0% win rate), and Brown-dyed blocks had 1 win and 13 losses (a 7.1% win rate).
Which is interesting! Pink was the best-performing dye colour, but even it only broke even. No dye colour had a winning record. Voters didn't really seem to favour dyed variants unless the specific block had a strong identity. Beds, Candles, and Shulker Boxes could survive; Banners, Stained Glass, and a lot of Terracotta/Concrete variants usually couldn't.
Functional blocks were very strong. Bookshelf, Furnace, Brewing Stand, Lectern, Chest, Barrel, Crafting Table, Ender Chest, etc. all performed well.
Plant/nature blocks were also strong, especially flowers, moss, azalea, leaves, crops, mushrooms, and other natural blocks. The most popular flower was Tulips!
Ores and mineral blocks did very well, especially iconic ones like Diamond Ore, Ancient Debris, Block of Diamond, Emerald Ore, Budding Amethyst, and Amethyst Cluster.
Wood was split overall: Cherry, Warped, Oak, and Dark Oak did well, while Acacia, Birch, Jungle, and Mangrove struggled.
Plain Terracotta got destroyed, but Glazed Terracotta actually did really well. Planks were also bizarrely strong - only Mangrove Planks lost.
Stone/masonry was mixed-to-weak. Some iconic ones survived, but a lot of slabs, walls, stairs, polished variants, and stone-adjacent filler blocks lost.
Copper had a rough time, despite a few wins from oxidized variants and bulbs/grates.
Dyed decorative blocks mostly lost, especially Banners, Stained Glass, Hardened Stained Glass, and Concrete Powder.
Banners were the unluckiest category. They went 0 - 18.
Stained/hardened glass was almost as bad, going 2 - 61. The two survivors were Purple Stained Glass and Cyan Stained Glass.