I looked at the technicals on both stocks, and they are about equal. Of the three AAPL is the best buy by far. Technicals on AAPL are bullish, technicals on GTAT and GLW are both flat on a six month chart with a slight edge to GLW.
GLW pays a good dividend and has good history. I understand they have a new version of Gorilla glass that you should watch for. A good buy and hold option.
Not comparable, one is a more mature company and the other is an up and coming spec stock.
I need an experienced investor to give me a suggestion. A lot of rumors are out about Apple's iPhone 6, and I am not sure which is the better buy.
