Whatever you do, if you like the Otterbox DEFENDER case (which me being in construction is the case i have used for the last 7 or 8 phones), absolutely is NOT the case you want to have if you dont want the phone falling out of the belt holster.
Every DEFENDER case ive had has always had the back corners as deep pockets with the corners of the front (where the release tab is) rounded and cupped like the back, just shorter, allowing the phone to really snap in tight, and no way for the phone to just fall out. Well, the G6 DEFENDER case doesnt have those small cups on the tab side. The 'tab' is the only thing holding the phone in and as i was walking across the parking lot today, it just fell out. I knew when i first got it and installed it on the phone yesterday that i had a feeling this was going to happen as it just doesn't fit tight.
I called Otterbox today, and being the reputable (altho expensive co. they are), they are paying for shipping and going to refund my money on the case. When i talked to them and told the the engineering flaw with the case, they said they would pass the word on to those that need to know. Now, if they actually modify the way the holster is made remains to be seen.
I picked up the SUPCASE Unicorn Beetle Pro from Amazon, and its as close to the DEFENDER as any case ive ever seen, and the holster is actually damn near identical to what the normal DEFENDER holster is. So far i'm liking this case, and it seems like its as close to a DEFENDER case as you can get. The outer rubber shell isnt quite as grippy as the Otterbox, but its really close.