I have owned both phones. I ended up returning my s6 edge and keeping my LG G4. Below is a review I wrote on why I made that decision. I hope it helps you...
By Joseph Sukits(contributing editor of my own opinion):
The tale of two flagships. LG's new G4 vs's Samsungs's S6/Edge
Lg, with the G4, has definitely done a much better job of finding the Balance between build quality and functionality. I am an avid smartphone technology enthusiast. Over the past 4 years I have owned almost every flagship device available by every major manufacturer. I have even ventured beyond the major manufacturers in search of the holy grail in regards to smartphones. A great example of a wonderful phone by one of the smaller manufacturers would be the oneplus one by ... That's right.... You guessed it, Oneplus. Anywho.... Getting back to my point, I have owned a buffet of amazing devices over the past few years and at one point they were all my daily drivers. I am, what I have read is considered, a "power user". In my humble opinion, Samsung, with the s6 and its fraternal twin the edge put so much emphasis on overhauling the physical design of the phone(s) they skimped on providing a truly enjoyable user experience. For a "power user", multi tasking is a very important aspect of the user experience. The S6/edge, due to issues with its RAM, provides one of the most frustrating user experiences I've encountered in quite some time. When a phone is marketed as the best phone money can buy and priced according to that philosophy(900 + dollars for the edge), there are expectations that running multiple apps simultaneously be a smooth, efficient experience. Those expectations are laid to rest after a week or two with the S6/edge. As soon as the memory fills up, the problems begin . For the average user who just uses their phones for taking the occasional picture, Facebook, videos and web surfing..... the flashy new aluminum and glass look will be enough to warrant the expense as well as go down in flames defending the decision to justify it. However, for the true "power user" who uses their phone for literally everything making it a direct extension of how they efficiently live their lives.....as many people do these days, the s6's shortcomings as they relate to user experience become very glaring. I had mine for 3 weeks before getting a warranty replacement due to the fact I thought something was wrong with it. After receiving its replacement and it mimicking the issues of the phone it replaced I began to realize that the problem was not isolated. Samsung has a severe RAM issue with its new flagship. After diligently researching similar experiences had by others .... Same phone.... Same experience..... Same frustration ... I found that Samsung quietly has acknowledged that the issue exists and has promised to fix it with future software updates, which to my knowledge, have yet to occur.*
The G4 on the other hand has been a complete joy to use in every way. Is it going to win the award for most beautiful or cutting edge design? The answer to that would be No. However, it is a sharp design laced with sophisticated humility. I think Balance and humility are the cornerstones upon which this masterpiece was created. The design does not stand out even with the leather back option and it doesn't use the most powerful system processor under the hood. Even so, the phone is designed and engineered so every piece systematically compliments the one sitting next to it optimizing the performance of the phone as a whole. In sports they say for a team to be truly successful, one person can not be greater or more important than the team as a whole. Unless of course you are Michael Jordan and the Chicago Bulls. The same theory applies to the difference between a good phone and a great one. With the G4, not one component or concept truly stands out(excluding the unbelievable camera) but the phone as a whole is a well balanced masterpiece that can efficiently handle anything you throw at it. For me personally, if ya can't tell, I'm a huge G4 fan. I may have finally found my smartphone Holy Grail.....
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