Nice to see you join us here Angelus
I've seen arguments on both sides of semihorn vs carbon.
By my way of thinking, both bows are backed by carbon so whatever's on the belly can't affect the bow too much and horn is heavier than carbon so I would think carbon shoots a little faster..
But in any case the semihorn is plenty fast, I initially shot 8gpp arrows but the shots were so fast that they were difficult to follow with the eyes so I switched to 11gpp arrows and it's still one of the fastest bows at my club.
The only significant difference is the price and appearance. You have to ask yourself if the slightly more authentic look is worth ~$80 to you