I tend to like large because I feel like travelling in Terraria is more realistic and fun the larger the world gets. Also, I don't really mind waiting for the world to generate on my switch, as it only takes a few minutes.For me it is the medium because not too hard to generate for my PC and not too small so it stays an adventure.
medium worlds are the best but i still think that having 2 or more corrupted biomes because it takes a lot of work beyond necessary.I like Medium sized worlds the most. They give the right balance of still giving plenty of space to feel big enough, with a lot of ores to mine, and treasures to discover, while not being too overwhelming with travel distance.
On large group multiplayer playthroughs, I do prefer the large size on those. But otherwise when I'm playing on my own, Medium it is.