The Spearow Line
As a kid, I always liked Spearow more than I did Pidgey. I think it's because it not only has a higher attack stat, making it "stronger" in my kid mind, but because it looked scruffier and angrier- something that I've always liked in Pokemon designs. I also liked that it reached its final evolution earlier than Pidgey did, which I used to think made it more useful.
Despite all that, Fearow never made it onto my final team in LeafGreen as a kid. Granted I never made it far in that game anyway, but Fearow never made the journey with me. To me it's always looked a little weird, going from small and scruffy to very... long. It always struck me as a weird evolution, though I've gotten used to it over time.