X cyclones are probably the longest of the cyclones. They are very controllable and workable on a lot of lines. They also last a little longer than pro-d clones. They are a lot like a slightly less stable dx gazelle. I actually prefer gazelles because they are a little longer, I do think cyclones are better on shorter lines that need a lot of direction changes.
S Sabres were fairly short for me when I last tried them...maybe 85% of the D I was getting from gazelles at the time. They are extremely straight....like pretty much the straightest disc Ive thrown. Very stable when flattened from a hyzer in calm conditions but they didnt hold up well in windy situations. They dont seem to have any glide at all. They finish dead nuts straight which is pretty cool.