3.  Hiryuu Shoten Ha vs Sho ryu ken
 Ranma's is obviously more flashy, but Ryu's is defintely stronger.  In a
manga published in the U.S. (Tokyama Comics I think?  Yes, I own it.) Ryu
commented that the odds on someone getting up from a *single* sho ryu ken
are next to nil.  Getting grazed by one is bad enough.  All Ranma's Hiryuu
Shoten Ha does (that I've seen) is toss someone high into the air.

The sho ryu ken can be dodged, which is more Ranma's style anyway. The best
way to avoid damage from an attack is to just get out of the way.

Also, there's nothing only about the Hiryuu Shouten Ha. Being tossed high
into the air and spinning rapidly is not something you can shrug off. The
spinning rapidly part would cause you to black out as well mess-up your
inner ear while doing it (the blood is forced into the brain, causing the
swolen vessels to compress the tissues and make them cease functioning, as
well as threatening a hemorage, which is not a Good Thing), and being
dropped from a high place unconscious is not healthy either.

The circumstances requiring a Hiryuu Shouten Ha would also make avoiding
one impossible once it's thrown. Your opponent has to be hot from anger,
which means that he would be very seriously pissed off and not thinking
straight. Ryu would never see it coming

Something that people need to remember is that Hiryuu Shouten Ha requires
the opponent to get *very* 
angry. How often has Ryu, not including when he was shot and became evil,
*ever* lost his temper in a fight?
Wouldn't this make it a little unlikely that a Hiryuu Shouten Ha would even
be possible in this matchup?
Just my $.02 ;)




     Outlaws Law #1:Reality is just natures way of saying you have no
imagination.