I think they all have their appeal Kazz.......
It is lovely to see/get a new kitten in the Springtime.....it's like your garden...new life begins....
In Summer....well, what better sight to see your cat laying outside in the sunshine or chasing the butterflies.....
In Autumn....the night's are drawing in, the cats (if they are outside cats) are coming in earlier after playing with the odd autumn leaf.....
In Winter..... they are perfectly happy to curl up on your lap and welcome lots of fuss and attention!