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Ranma will win by a landslide.
Kenichi's 6-in-1 martial arts won't stand a chance to Ranma's "supernatural" Techniques, and Ranma ideology is "anything goes", which has unlimited ways and He also has mastered several styles of martial arts, which balances him with Kenichi in Martial art quantity.
A practitioner of the Anything Goes Martial Arts is expected to be prepared to do almost anything to triumph regardless of the challenges, humiliations, or cheating involved.
Facts about Ranma Durability (From wiki)
-He's durable enough to withstand the full power of Ryu Kumon's, large iron Buddha-statue splitting, "demon god assault bomb" vacuum blade-barrage, and immediately continue to fight afterwards. (which, at the very least, would qualify him as bulletproof)
-managed to withstand exposure to Rouge's and Saffron's firestorms.
-fallen hundreds of meters into solid stone with only minor bruising
Super "techniques", can be like a Ki Blast, which Kenichi doesn't have or can counter.
-Shi-shi Hokodan -> later changed to Moko Takabisha due to Ranma's bad affinity to the former.
-Ranma creates brief energy sphere that sends opponents flying back.
-Hiryuu Shoten Ha
A cinematic attack in which Ranma circles around the opponent rapidly creating a whirlwind that sucks the opponent into the air and drops them on their head.
->Since this will not work with Kenichi, he can use Hiryu Korin Dan, A variation of Hiryu Shoten Ha used when there is enough heat in the atmosphere (such as residual battle ki), if the opponent attempts to use a cold - based attack to counter the Hiryu Shoten Ha, which uses a cold blast to turn the residual heat into a giant descending ki blast (powerful enough to damage a large part of a mountain)
"Kenichi has Ryuusei Seikuken"
Ranma has - Umi Sen Ken: A technique originally created for burglary, it makes Ranma effectively invisible to opponents, including sixth senses such as ki senses. This is used for getting behind opponents for sneak attacks - he needs to remain emotionless to use this, so if he is provoked he is brought out of this state.
I actually read both Manga. And yes, Kenichi isn't in full potential.
it's a landslide victory for Ranma Currently.
so, unless Kenichi develops some "Ki Blasts" He won't stand a chance, cause Ranma can Spam "Moko Takabisha"
and it's not a VS THREAD, if it doesn't have OutskirtsBattleDome Data
http://outskirtsbattledome.wikispaces.com/Character+Profile+-+Ranma+Saotome
http://outskirtsbattledome.wikispaces.com/Character+Profile+-+Kenichi+Shirahama