I loved Tailow out of all of them :3.It was my first bird Pokemon ever and I've loved it no matter what other people say. Apart from being utterly adorable ^^, I've loved how it can use some diverse moves and how speedy it is.
Swellow is a powerhouse,being one of the speediest bird Pokemon and deadly.Also I love the designs,red and dark blue along with white? That's just awesome :D.
I have to say I have a little love for Pidgey as well since it is also really cute ^^. I've used one in HG and he was a decent guy :D.