The XA2 is new. If jolla doesn't work as expexted, i think the XA2 will get android-updates two years longer.

bigger display 5.2" vs. 5.0"
39h talktime vs 10h talktime
863h vs 580h standby
LTE cat12/13 vs. LTE cat6
bluetooth 5.0 vs 4.2
dual SIM vs. sinlge SIM
8core vs 6core

and some other things more.