Volla company have team of people working on support. they even sold their devices with Ubuntu Touch pre-installed. (And it is a German company and Germans wants quality, so they cannot afford to sell crap). so all Volla phones is and will be supported probably the best.
some core developers also have Fairphone 5 (some even a Fairphone 4 somewhere) so that will be supported well too.
some core developers also have Fairphone 5 (some even a Fairphone 4 somewhere) so that will be supported well too.