I have never heard of a "Wileyfox Swift". If you need an awesome and capable Android 7.0 based dual SIM phone with zero carrier crapware/bloatware and a close to stock Android experience, the OnePlus 3T (64 or 128GB version) is a good choice.
Since Oneplus' falling out with Cyanogen Inc, and the financial failure of Cyanogen, Oneplus' own OxygenOS is essentially a re-implemented CyanogenMod that has all of the same features.
I've almost buyed the Wileyfox Swift last week, but I'm glad that I've seen discussions around Truecaller and the Zen ads, which changed my mind and opted for a BQ Aquaris X5 Plus instead.
The thing about that was, Cyanogen stayed very silent and OnePlus's entire advertising strategy was very dodgy. I suspect Cyanogen was just sick of OnePlus's shit when they signed with that 2nd Indian distributor.
Now that the Cyanogen company is dissolved, who knows what the truth was.
Lately I've started using CarbonRom. It's pretty nice.
no, it's actually the reverse, oneplus got sick of cyanogen's shit when cyanogen threatened to sue them for selling oneplus phones in India, which is a huge market. Cyanogen (Incorporated) claimed they had an exclusive agreement with an Indian company called Micromax to sell cynaogenOS phones in India. Oneplus got fed up and re-implemented all of the great features of cyanogenmod in their own fork of android (OxygenOS/HydrogenOS, respectively for english and chinese language markets).
Cyanogen Inc ran themselves into the ground with dodgy business practices and threatening all of their partners, which resulted in no reputable phone manufacturer wanting to put their OS on any new models of phones.
Since Oneplus' falling out with Cyanogen Inc, and the financial failure of Cyanogen, Oneplus' own OxygenOS is essentially a re-implemented CyanogenMod that has all of the same features.