I don't think there is any doubt that the LG G4 and Samsung Galaxy S6 are the top two Android smartphones currently available, or coming soon. Here are my top seven reasons that the LG G4 is the better business smartphone.
microSD expansion card: Internal memory is expensive and with a microSD card you can extend your memory with inexpensive SD cards. Security is often raised as a concern, but with the LG G4 you can always encrypt your external storage cards if that concerns you.
User replaceable battery: The LG G4 comes with a 3,000 mAh battery. You can always buy a spare and I'm sure third party vendors will soon launch larger capacity variations as well. It's much quicker and more convenient to pop in a spare battery when you are out and about than it is to plug in a battery pack.
Larger display and higher screen to body ratio: The LG G4 has a 5.5 inch display compared to the Galaxy S6 5.1 inch size. It isn't a huge difference, but combined with the 76 to 70.5 percent screen to body size ratio the LG G4 provides more screen with less bulk.
Replaceable back options, including leather: The leather back looks classy and fits in perfectly to the business environment. You can always swap out for plastic or even another leather color to match your attire.
Solid battery life: For the same daily routine I am seeing a couple more hours of battery life from the LG G4 than I saw with the Galaxy S6. It isn't as stellar as the iPhone 6 Plus or BlackBerry Passport, but it will get most people through a full day.
Camera: The Galaxy S6 camera blew me away and it is stellar. However, the LG G4 has an even bigger aperture to let in more light and has OIS 2.0 with three axis stabilization. It also has laser autofocus and tends to capture moving objects a bit faster. You can also shoot in RAW with the LG G4.
Performance and Android software: Despite the Samsung Exynos processor, I regularly saw lag and pausing on the Galaxy S6. I have yet to see any slowdown on the LG G4, even with the use of a Snapdragon 808 processor. The LG G4 also ships with Android 5.1. Samsung stated they will update the Galaxy S6 to this latest version, but we all know how quick Samsung is to release software updates.
There are also benefits to buying the Galaxy S6 over the LG G4, including a fingerprint scanner and physical home/camera launch button, integrated wireless charging (you can add a Qi back to the LG G4), and included Quick Charge 2.0 adapter in the box. However, overall, I personally feel the LG G4 is the better device.