Yep. What he said.
Personally, I can't imagine shooting without a release. I tried it and it really hurt my fingers, I cannot do it. The shorter the bow limbs, the greater the pinch on the fingers too. Not to mention, if you have to hold at full draw for any length of time and you've got it cranked up to 65 or 70lbs. I had to hold two full minutes at full draw one time while a Bull Elk stood there and looked at me. I drew when he walked his eyes behind the tree and then he just stood there with his boiler room behind the tree. I always wondered what would have happened if I'd tried to shoot him right between the eyes. I feared only wounding him, hitting him in the end of the snout or something and he'd run off and die miserably because he couldn't eat so I didn't. He was a 5x5 satallite bull, kind of a rag horn anyway.
A mechanical release, that's another $50.00 - $75.00 bucks, -I haven't bought a new one in 20 years or priced them...
I still shoot aluminum arrows with an overdraw shelf. 2215's. It's been a long time, but I think the first numbers are the spline diameter and the second set is the wall thickness?
My bud uses graphite arrows. I can tell you this much, he shoots a decent Martin bow and he uses the ONE sight pin for 20 - 35 yards, another out to 50 and one other pin with graphite arrows. He says they shoot that flat.
With aluminum, I'm chronographed at about 250 and I have sight pins (cross hairs actually) for 20, 30, 40, 50, 60, and a 70. In all my years, I've just never taken the time or spent the money to try graphite.
Truly, there is quite a bit to arrow selection and dialing in the bow. Draw length will need to be measured and the bow set up for "him." We'll obviously be glad to offer help, but you really need a pro shop with a range to dial everything in.
Single cam, double cam. Lot's of theory there too. Personally, I have only ever owned a double cam set up so I can only speak to that experience. Launching the arrow accurately is all about dialed in equipment and released energy and your ability as the shooter to stand there and hold the cocked bow until you let 'er go.
Which is easier or best? I dunno.