Fall. Perhaps because I am in the autumn of my life and don't like the thought of the approaching winter.

https://www.youtube.com/watch?v=ERK66Hl6Zz0

Try to remember the kind of September when life was slow and oh so mellow,

Try to remember the kind of September when grass was green and grain was yellow,

Try to remember the kind of September when you were a young and a callow fellow;

Try to remember and if you remember, then follow!

Try to remember when life was so tender that no one wept except the willow,

Try to remember when life was so tender that dreams were kept beside your pillow,

Try to remember when life was so tender when love was an ember about to billow;

Try to remember and if you remember, then follow!

Summer because it has the nicest weather, I don't like winter because of the fidget cold and snow, spring is kinda warm but rainy, and fall means winter is near so I like summer best. 

Hahaha good question.

I grew up loving Summer, I used to be that kind of person that loved waking up sticky, but today I really hate that. I started to appreciate the cold weather (not too much) and hot days have been not longer my lovers.

Nothing remains the same and I love that...

However, I would choose Spring because here in Brazil I can feel that Spring is the only season which I feel everything being 50/50 of everything: cold, hot, fruits, green nature,  rainy days etc.

If I have to choose something to live forever with I guess that Spring would never let me down. =)