GasturbatWell the HI2050's are 60 ohms so an amp may become more necessary depending on what you're using them for and if you want them to be driven harder. The SHP9500's will be driven fine on any device without an amp. The HI2050's do not have a detachable cable, the SHP9500's do which I personally like because I can swap it for a much shorter cable when I'm traveling about. So really, it depends what you are looking for in your headphones. The build quality looks about the same and they weigh pretty much the same (11oz vs 11.5). Oh and the box and booklets are all entirely in Chinese, so there's that too. That's more of a personal preference though as I am one of the few insane people who actually like to read the stuff that comes with all of their products.
To me it's a no brainer and the SHP9500's are the much better deal.
GasturbatI was on the same boat as you thinking about the two but i decided that the SHP9500's were a better option because the cable is detachable and replaceable which is a huge plus in my opinion.