Both of you go to a gun store and handle an AR and an ak. Pick out the one that you liked the best. Generally, the AR 15 is more accurate and easier to hit things with at longer range. The AK 47 is about half of the cost of the AR .The AK costs not that much more than the sks and takes removable magazines and it looks cooler. The sks and ak both use the same ammo but between those two I recommend the ak, unless you just like the looks of the sks better. The AK 47 is a more simple weapon, easier to use, easier to clean and I think I would recommend it for a new shooter and especially one that likes to shoot a lot because ammo is cheaper. After you get more experienced, you can always sell it and upgrade to an AR