So the reason people are still buying OW+'s is charge time. You are correct on the range being equal but it's a ~20 min charge time vs 120 min charge time. So when we did group rides in the city or trails, we'd make sure there is a power outlet near by, grab a coffee and sit for half an hour while all the boards recharged.
For people looking for crazy battery range, the OW+ allows for more ways to add range (Two-X, X2, X3, EGO, etc...).
That said for you, it might be nice to have all Pints that share charges and range... but your kids will get more miles than you due to weight. So... you may actually need an XR to get the same mileage per charge as them.
And if you look around, used OW+'s are going for $800-900 typically.