iPhone 6s vs. iPhone 5s: 5 Things to Know in May

Processing Power

Apple's A7 processor is also outdated and there's a very good chance that these two iPhone 6s models will deliver more horsepower than the company's 2013 flagship. 

iPhone 6s rumors in May have firmed up around an Apple A9 processor. If this is true it will likely be a step up from the A8 chip found in the iPhone 6 and iPhone 6 Plus. Improvements to the processor, and software, could mean better looking games and improved battery life.

Early reports also indicate Apple will boost the RAM from 1GB to 2GB. Kuo backs those rumors as he also believes that Apple will add 2GB of RAM to the new iPhone. That would be huge for the iPhone 6 Plus series, a series that is excellent for gaming and multitasking because of the big screen.