Long story short: You will not find a mobile phone with a better compromise of state of the art hardware, reliability, percentage of open source parts, tweakability, android app support etc. etc.
Please @Fubo and others, consider spreading the word outside this forum. There was a discussion on r/linux this morning (which has ~1.5M users!) and people didn’t know about SFOS or thought it was dead or unusable:
https://www.reddit.com/r/linux/comments/1f5e5cv/mobile_linux_needs_more_love
Given that SFOS devices are not sold in the US and MeeGo was killed quite abruptly, I think SFOS has too little visibility and/or is not taken seriously, but it is much more practical than what people think.