Point o two cents here only.

I think it has a lot to do with what you're trying to achive. For 'close in work,' or tip chucking my 'belly' will be very short. For far out and fine I love a very long belly line such as the SA series designed by Dr. Way Yin and Steve Chote.

Love most of the RIO lines, but there 'new' long belly line is a ... well never mind; not a complementery statement. Like trying to cast a rope on all but a few rod designs (stiff tip Euro's).

That's the 'hell of it' with 2-handers; you can spend a LOT of money on lines to fine out what works for you ... and more particularly .. the rod.
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fae