The 6 plus is almost as big as Apple's follow up to the iPad, the iPad mini. The phone is the thinnest, so far. With the iPhone 6 being 6.9 mm thin, and the iPhone 6 plus being 7.1 mm thin, no cases from previous Apple devices will fit the new model. This means you have to spend more money on a case, as if you haven't spent
enough on the phone already. The display is considered
to be more advanced, as well. Apple claims it's "pushing the edge of design," although in my personal experience, I see no particular difference in the display-- especially nothing of any major significance compared to other Apple products.
When you take a closer look at how the two phones compare, you'll need to consider what you do with your cell phone on a daily basis. If you use your
phone to call and chat with friends, the iPhone 6 (or other Apple phones) is your best option. If you use your phone frequently for work and more complex tasks, the Samsung is a better option for you.