Ultimately, it's your decision. If you want the bigger screen and better battery life, wait for the plus. I don't personally care for the bigger form factor. I love the size of the 6s. I think a lot of the issues are with iOS 9. Maybe try the public beta 5 and see if that helps with your freezing issues.
Also, if it really is a hardware issue, Apple will replace it for you. They have stock specifically for replacements. But they will only replace for the exact model/size of the one having issues. You won't be able to go from a plus to a 6s or switch capacity or colors.
10-14-2015 06:09 PM