The similarities would be a shorter list. A Fatboy is a Softail and a Road King is a Touring bike. The frame is completely different. If you are talking about 99-newer then the motor is even different (the Softails have solid mount balanced 'B' motors and touring bikes and Dynas have rubber mounted motors).
The answer is subjective. My pick would be the Road King
Harley davidson
King cobra is more deadly
The 2003 Harley Road King is worth $9,275 depending on the condition.
There have only been two King Charles's in England.
monarchy is ruled by a king and is treated unfair
Rufus Harley went by "Pied Piper of Jazz".
My research shows the 2009 Harley Road King produces 80 BHP.
One will find that one can purchase a Harley-Davidson Road King in the United Kingdom is online at the official 'Harley-Davidson' website. One might also want to read the Motorcycle News for local people selling their Harley-Davidson Road King.
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We don't know this Answer.
They are monarchs and you are not. - This is a dumb answer.