This is a hard one and I haven't voted yet.
I really like a well marked motley. Y'know, the ones that look like their dot spacing has been marked out with a ruler! I also like it when the motlies have a lot of the 'saddle' colour and less of the background, so a cubed style doesn't do it for me.
I got my first aztec a few months back and she's sparked my interest in that pattern. A snake with a really bold, clearly defined aztec or zig-zag pattern is quite spectacular.
Stripes don't do much for me.
Diffused I like a lot, but to what degree depends on the colour variant...LOVE DIFFUSED LAVENDAR!
In a normal, I like there to be a distinct difference between the saddle colour and the base colour...but that's a bit of a theme in all the snakes I like.
Can't pick just one sorry, but if I had to answer I'd say a good Motley I suppose.