I’d go with CalyxOS. Install is also easy, but graphene touts allowing Google play services to be used… The very part of the picture that drew you to this comments section. You don’t have to install it in graphene, but then almost no apps work right.
CalyxOS use microG, a fully open-source spoof of Google play that is super light on battery, allows most apps to work fine (including banking), etc. Some apps like Pokemon go don’t, however.