The recent iPhones shapes with wide rounded corners and lines on the back have been 100% copied from HTC anyway. This is a known fact. Though I've been a (Windows Mobile Professional only, of course) HTC user for years, I find the new Lumia rantangle shapes with slight round corners much more beautiful, and seriously, I don't thing they look cheap (though I admit the Lumia 650 I just bought for my wife looks is gorgeous - and is incredibly lightweight).
Anyway, I'm currently using a simple cover for my 950 as I'm using a belt carrying pouch :
Ultra Thin Black Rubber Cover Case for Microsoft Lumia 950 | eBay
Here is the 950XL variant (couldn't find the black one from this provider, but you should be able to find it) :
Ultra Thin Red Rubber Cover Case for Microsoft Lumia 950 XL | eBay
Easy to fit, provides an excellent protection, scratch proof, direct and easy access to the buttons (doesn't cover them, so doesn't make them harder to use, yet protects them as they don't protrudre from the shell).
It protects both the screen and the rear camera with a (discrete) protrudring lip, so none of them would touch the surface on which you put the phone.
Actually, I'll soon use it naked as I've received my brodit craddle, so I'll have to remove this cover... But I'm going to regret it if I ever drop the phone.
Now if you're not using a belt hoster nor a car craddle and carry the phone in your pocket or a bag, then the absolute best case IMHO is this one (or a variant) :
Artificial Leather Case Microsoft Lumia 950 XL Bookstyle Black | eBay
Here is why I say it's the best :
- It offers the same protection and comfort as the simple back case above (it's basically the exact same case, actually), with a snug fit yet sufficiently easily removable, lightweight, shock and scratchproof material, easy access to the buttons, etc.
- The flip cover doesn't have an annoying tab on the edge like lots of other medels. Instead, there probably are some magnets inserted in the left side edge of the back case, as the front flap magnetially holds in place when closed ! Simple, elegant and terribly efficient.
- The same flap also magnetically sticks to the back cover, thus staying open by itslef when using the phone instead of clinging loose like all other wallet covers you can see around !
- In addition, you can fold the back flap to form a kickstand.
Honestly I can't see anything better to protect it if you're not using a holster. Given the ridiculously low price, I bought one for the 950 in case I would use it in a cary bag when travelling, and though I'm not currently using it because I've always been a holster maniac, I found it so terrific I bought one for my wife's Lumia 650 (actually the second variant below).
Here some variants, the first one being allegedly made of real leather (I'm not quite sure about the "real" leather stuff considering the price, but you could still give it a try) :
Hot Flip Genuine Leather Card Slot Wallet Case Covers for Microsoft Lumia 950 XL | eBay
Luxury Flip Cover Stand Card Holder Wallet PU Leather Case for Nokia Lumia 950XL | eBay