This doesn't really answer the question. But it's an old sheet that offers a quick reference between the motors purely on spec. It's not up to date, but it gives you an idea.
http://gallery.myff.org/gallery/4344...otor+Table.xls
My opinion doesn't qualify on motors, only used Novak Velocity. 5.5R, 4.5L, 6.5 Bonded. About to receive 7.5L and 6.5L. I like them, but they do not like wet at all and will stop at the slightest hint of water near the sensor wire. Blue tac a must if outside.