i was a dealer of motorcycle imports from china in 2002-2004 and now has motorcycle spare parts business.
chinese motorcycles have good structures and usually are replicas of honda parts. same shape but oftentimes different dimensions.
Now, if you consider affordability, go for chinese made. if your an enthusiast, go for japanese brands.
big question is, whats the difference? its not the quality of work, BUT the quality of materials that were used. try to notice, chinese motorcylces are heavier. mas mabigat ang bakal from china compared to japanese.