A friend has the old 10150-4 brown sage. I currently fish the new 8/9 grandspey on my 9150-4 and like it very much. He would now like to get himself a grandspey. Should he get the 8/9 or 9/10. I've cast my 8/9 on his rod and it works pretty well. We don't have a 9/10 to try. So for those long belly specialists....any thoughts? Thanks for the help.