The real Hondas are made of much better quality all around. Better aluminum alloy, better cast flywheel, forged crank. The motor also come better assembled. With the clone you will have to go through it and double check everything if your planing on running it without a govenor.
I put a 13hp Honda clone on my 79 Odyssey. It has been great so far but I only have about 5hrs on it. It fit great and was easy to install. It is electric and pull start and always starts right up no matter how cold or long it sits. Got it from eBay for $275 shipped. It was new.