I have tried a lot of large screen smartphones and for my life as a 2 hour train commuter, professional engineer, regular business traveler, and father the Apple iPhone 6 Plus is the best big screen smartphone I have ever used.
However, we all have different needs and thankfully there are plenty of choices available for all those various needs. Let's take a quick look at the iPhone 6 Plus before taking a look at six good alternatives, all with displays at least 5.2 inches in size.
The LG G3, see my review, is one of the best Android phones available today. You can buy it from your carrier and be confident that you can use it for years with an external storage card slot and removable battery. It is big, but doesn't feel that big with the rear buttons and minimal side bezels.
I had an Xperia Z2 for a couple weeks, but felt Sony makes the phone longer than necessary. The Z3 has much the same form factor with a few internal improvements and will be coming to T-Mobile soon.
Prior to purchasing the Apple iPhone 6 Plus, the Nokia Lumia 1520 was my primary device. If not for the lack of apps then I may still be using it today more than the iPhone 6 Plus.
The Samsung Galaxy Note 4 will be coming to US carriers in October. The Note series sets the bar for stylus input and advanced functionality. It is also the Samsung devices with the highest specifications released each year.
Huawei has been rolling out some fantastic high end smartphones and the Ascend Mate 7 is their best effort yet.
Last year's Moto X was one of my favorite devices ever, in large part because of its diminuitive size. Motorola went a bit too far, IMHO, and made a large phone with the new Moto X while not putting enough into the battery.