I went to get my case today as the Spigen one I had on order from Amazon failed to arrive, again.
I had no preconceptions about which case I was going to get so I wanted to try a few.
Luckily the guy in the store was happy to let me unbox cases as I was letting him play with my 6+ (no jokes thank you

) as they hadn't seen one in the flesh yet.
I tried a couple of third party, both silicone and hard plastic and both the Apple leather and silicone cases.
I settled on the black Apple leather case. It feels really nice in the hand and I was surprised at just how little bulk it added to the iPhone compared to some others.
So yeah, another vote for the Apple leather case.