Somewhat between Zapdos and Articuno. I always thought Zapdos looked neat, and I thought its typing was awesome, although Articuno definitely was the prettiest of the three. I would have liked them all near equally if it weren't for Moltres, which I don't mind but it's just...not quite as interesting as the other two are to me, I guess? Not just in looks but also in typing. "Oh...another fire/flying, yawn compared to the other two birds then."
And yet I think Moltres is the only one I ever really tried using in a team back then, ah ha. Didn't last for long though. I don't recall being a big fan of using legendaries.