Used to be spring, but then I met my wife and watched her absolutely suffer with the pollen (like eyes swollen, can't breathe type of suffer) and so I'm a little more partial to winter now. Anything cold, really, as I can't stand the heat!
P.S. What is actually the difference between autumn and fall?
Autumn and spring :) I really like the mild weather, whether too cold or too hot.

The beginning of Fall, for sure! When the leaves are still dry and crunchy.
Summer!
I love fall but summer is a close second!
I love fall! I love the colors, the crunchy leaves, the weather, I love pumpkins and Halloween and just everything that comes with fall!
We call it Autumn in Australia (Fall) not hot and not cold
I wish I could go back in time..
I love fall, especially now that I'm living somewhere that actually has seasons! The colors are so beautiful and I hate the summer heat so I'm always glad when it's over.
Spring. Not too hot not too cold (usually). Also seeing things begin to bloom is exciting, especially if you were the one to have planted them.
Fall. Perfect light jacket weather
Until recently, I always loved both summer and winter best. Maybe partly because I work in a school and those seasons get the best school holidays XD but also because I enjoyed the more extreme weather. I liked being able to stay outside for hours on end in the summer, go on long walks and hikes, etc. and then in the winter I'd enjoy snuggling up in multiple layers with a hot drink.
Nowadays, though I much prefer spring and autumn. Unfortunately, my asthma has deteriorated a lot over the past two years and I now struggle to breathe a lot more in extreme weather (especially when the temperature changes very suddenly). And climate change isn't exactly helping in that area either! I'm a massive nature freak and I love what happens outside during the spring and autumn.
I have a bit of an obsession with blossom for reasons unknown, and am lucky enough to live surrounded by fruit trees that blossom beautifully in the spring. I love looking out of my living room window on a spring morning to see pink trees everywhere! :D Even more exciting, I get all kinds of beautiful wild birds visit the trees where I live (the trees in our communal gardens are kept well stocked with bird feed) and we get the best variety of them in the spring. I also love watching the days gradually get longer and being able to stay outside later.
I also love going on autumn walks. Autumn brings out the child in me and I often find myself looking for leaves that are all different awesome colours, and I like to collect conkers too and bring them home. I insist on bringing too many conkers home, and after I've decorated my own flat with them, I'll bring the rest to my brother and/or my parents and drive them crazy with little bits of nature in their homes that they never actually asked for!
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I love autumn for all the seasonal foods and drinks, the activities (pumpking patches, apple picking), and the absolute perfect weather! I also look the cutest in sweaters and jeans so it is my peak season!
It's really hard to pick a season... Probably Autumn. It's beautiful, cool but still nice enough to go out. The smell of burning wood and the crispness in the air. The excitement for the holidays. It's wonderful.