The why is the important part of this thread. I've been on a quest to find that perfect soft plastics rod because that is what I primarily fish and I have it narrowed to two different rods.
Rod number one is a 7'6" ML spinning rod.
Rod number two is a 7' M spinning rod.
The 7'6" ML is a good all around river Rod. When I can only carry one this is the Rod I carry. It really excels at casting small lightly weighted plastics a long ways. The Rod has a fast tip and can detect real light takes, but has enough backbone to set a hook effectively.
The 7' M is also a good river rod. I've never really liked M action rods for River smallmouth. I felt they were just too stiff feeling and not as sensitive as a ML action. On my search for that perfect Rod I've changed my mind. I've noticed I lose significantly more fish with the 6'9" ML I previously fished with due to poor hook sets. I feel the M power really helps drive the hook home and as a result less fish throwing the hook. I feel I lose a little sensitivity with the M power but it more than makes up for this tiny flaw due to more landed fish.
All rods are not created equal. The 6'9" ML doesn't have the same backbone as the 7'6" ML even though it's the same model/brand of Rod. I lose less fish with the longer Rod as opposed to the shorter Rod.
I fish primarily tubes, senkos, flukes, and hellgramites. I've fished for River smallmouth since I was a kid and to me it's the perfect gamefish.
Sorry this is long winded but it's my passion. I'd like to hear other opinions and suggestions on the subject. I'm always eager to learn from others.