While the code remains the same, the functionality is what matters. So, bring in the best features, write the lightest code, because a heavy page will take more time in loading.
Choose the one that fits your bill. For 3D gaming too, you have all the facilities available. There are open sources to assist you. So, go ahead and let your imaginations run.
If you do, then you would end up altering the whole functionality and finally spoiling them again. So stick to a plan, a concept and move on. If you get this right, you can be assured of a good.