JJ is right about low aspect jibs being easier to set. When the high aspect jib first came to Albacores pioneered by Nigel Young I think, (it was many years back and the memory may be fallible), it was faster especially upwind, but difficult to get right for the average sailor like me. Having used one for a season I suggested to Mike Mac that he made a mid aspect ratio jib somewhere between the two for me to use. This he did and shortly thereafter he used a mid aspect jib himself and it then became the standard jib that mostly all now all use and call high aspect. We have little to learn about jibs from Stars.
Ron James.