Well, the 5x and 6p have USB-C, but the Galaxy and Nexus 6 do not.
Honestly, the biggest thing that made me not want to get the Nexus 5x when it came out was the fact that it is limited to 32GB of storage. In a time where I am moving away from cloud storage, and liking local storage on the phone more, this is simply unacceptable, which made me cross it off my list. That, and lack of wireless charging, though that COULD be forgivable; however, it also doesn't support QuickCharge, and instead utilizes a proprietary charger for fast charging, of which NONE were previously sold. This means that all my quick chargers are now charging at normal charging speeds, and my Qi chargers are worthless.
I then seriously considered the 6p, however while it has the storage space to satisfy my needs, it still would charge slow as hell with that big battery charging at regular USB speeds. Oh, and the 'Fast Charging' USB-C chargers the 5x and 6p use have been sold out for a LONG time. The only thing that would make me consider ditching wireless charging would be QuickCharge or some sort of really fast charging, which when reality hits due to a supply shortage, it means I would have neither; also, even if I was able to buy them, that would be another huge expense added on for me with 1 car charger and 2-3 home chargers.
Then the Galaxy S7/Edge came out. I was also really tempted to get this phone as it seemed to tick all the right boxes. Expandable storage, durable, huge battery, and great specs. While it has micro-USB, it supports QuickCharge and wireless charging, and if I ever wanted to buy the faster wireless charging, I could get faster charging with wireless. The downside to this phone to me, was that it is a non-nexus device, which means slow updates, and I would eventually have to deal with rooting/ROM it. Then, I saw the repair guide for the phone and how difficult it is to even replace the screen, much less the back glass and screen, and I basically noped right out of the S7/Edge.
That leaves me where I am now, with a Nexus 5 I just can't seem to get rid of, waiting for a phone to take its place. Here I am with Marshmallow on my phone since last year, already looking forward to the next update, Android N, while non-nexus users are JUST now getting Marshmallow, with N probably not getting to them for another year. Even then, when Samsung/LG tend to push those updates as late as they are, they tend to be buggy as hell and destroy the experience. Hell, I know people with S5's that downgraded to KitKat 4.4 simply because of the issues they experienced with newer updates AND ROMS! KitKat is 3 years old!!! I've been offered by several people to buy my 32gb Nexus 5 off me because of all these reasons!
Maybe the next line of Nexus devices will do the job, but time will only tell. If I were to buy any phone right now though, it would probably be the 128GB Nexus 6p, or S7 if I had to finance through a carrier.