I like Rise of a King better as well. I found Sinjid kind of, one dimensional? I just didn't have that much fun playing it, while I thoroughly enjoyed Rise of a King.
Sinjid shadow of the warrior all the way! Rise of a king was fun too but Sinjid offers a little extra challenge with the last portal and more customizablity with 4 classes and like 100 weapons and armors and items to buy. Not to mention the skill system and the fact that you can obtain items from enemies