Pro Great screen ratio for multitasking
Like the Galaxy S8, the LG G6 has a taller display than most phones: most have a 16:9 aspect ratio, the S8 has an 18.5:9, and the G6 has an 18:9, or 2:1. This is fantastic for Android's newer multitasking features, as well as just general use. The vast majority of apps support this new display, so you should have no problems with that.
Pro Can be used comfortably even though it has a relatively large screen
The LG G6 has a 5.7" QHD display, yet its overall size is smaller than the Galaxy S7 Edge, and significantly smaller than the iPhone 7 Plus, both of which have 5.5" screens. This means that you get a bigger display with a more manageable form factor which makes it easy to use even with one hand.