Just do what I'm doing right now. Order a whole bunch of different types of skynthetic gut and try them out for yourself. They're so cheap it won't hurt your pocket to do so and it will be fun.
I ordered about 8 different brands and when one breaks I just string up with a different one and compare and keep notes. I just started so I've only compared the Forten natural vs forten white (not as different as some people have described here). Natural color just feels slightly more plush. I break synthetic in about 8-10 hrs of play so I just strung up one of my racquets with Gosen (natural color) day before yesterday. Looking forward to comparing it tomorrow