I got the 6. I wanted the 6+ but I couldn't deal with having a bigger phone since my Iphone 5 was barely fitting inside my pockets. Now having the Iphone 6 for a while I'm glad that I didn't get the bigger screen becuase as expected, my pockets is getting pretty small since the Iphone 6 came in to play.
The most mentionable things is that iPhone 6+ is more costly than iPhone 6. Now come to the other difference, The 6 Plus isn't just larger -- it has a higher resolution. In addition, the 6 Plus has a higher battery capacity. So I suggest you that if you have capacity to spent money then go for iPhone 6+.