​ one gets updated and is a flagship phone with customer support, the other isn't.

I cannot speak for the Honor 5x, I know little about it, however I can speak of the Nexus 5x and perhaps give some more info about that phone. On a number of different threads I've been warning people off the Nexus 5x. Since purchase it has been laggy and problematic. A huge frustration. I've not had any issue with battery, and find it the same as any other smart phone, but the lag made it feel underpowered and overwhelmed by today's expectations. Such a disappointment given how much I loved my old Nexus 4. Anyway, a few weeks ago Google announced they were releasing a patch in the march security update, and it contained fixes aimed at the Nexus 5x problems. I got this patch a couple of days ago and I can say it has resolved all my issues with the phone. It is almost like I purchased a new phone. The lag is gone, the camera doesn't crash the phone anymore, and works brilliantly, finally, and it feels slick, fast and good. At last! This isn't saying you should buy a Nexus 5x over this device on offer, but knowing that the reported issues with the Nexus 5x appear to be fully solved (it has only been a few days bear in mind), it might inform your choice.

Get a Xiaomi Redmi Note 3 Pro for this sort of money from china - Snapdragon 650, 3GB, 32GB rom - Antutu 79k

I am torn between this and the Nexus 5x...i know the differences spec wise but has anyone had chance to try both in real life?

every phone ive ordered from amazon has gone boobs up within 3 months, either not in stock or even sold any more too, but they have offered me the money that was paid back, shame there's never a similar phone with the same specs for the price paid though, so i always find myself needing to add 20-30£ each time.. Savvy business plan by amazon?

Is this better than Vodafone smart ultra? Thanks

still with my Samsung note 3 which is running fine, is this a good upgrade anyone knows??

I've got a Note 4 and I've heard this is on par

​The Nexus 5X is not a flagship device. The 6P is, but not the 5X that has many performance and battery issues.
For the price, the Honor 5X is a good phone, the fingerprint scanner works really well. It does stutter a little when multiple apps are open. The display is good, slightly better than the Smart Ultra 6, but it does cost more. Design wise, the Honor 5X is nicer, but the Smart Ultra 6 wins out because of its fantastic price. I'm currently using the Honor 5X, and the Smart Ultra 6 was my old phone.

I've found my Honor 5X battery lasts better than my partners Note 4...but, that could be how she's set it up.

Get a Xiaomi Redmi Note 3 Pro for this sort of money from china - Snapdragon 650, 3GB, 32GB rom - Antutu 79k