I think that once one has well developed facility on the instrument, it then comes down to musical context as to how one approaches soloing.
For example, in a 32-bar "straight-ahead" jazz tune (whether soloing over the head or trading 4's or whatever), developing phrases out of motifs (usually taken from the melody of the song) is definately the way to go.
In a more fusion-esque solo, I think it's kind of cool to just have a bunch of licks linked together, as long as it flows and is for the correct lenth of time! There still might be motifs, but they would be more abstract or hidden.
Did that make sense at all?