You all do know army has fixed wing, right? My son starts flight school this summer to re-train on fixed.
That is correct. However, if you are going Army Aviation, assume you will fly rotary wing. They are rotary wing pilots first and foremost (though I've heard rumors some may get fixed wing from the start).
Also, there is a major difference between being an Aviation Branch LT and being an Air Force pilot LT.
As an Army Aviation Branch LT your primary focus will be leading soldiers and warrant officers. Part of the emphasis is kind of messed up. An infantry LT is expected to be an expert infantryman- EIB, Ranger tab, airborne. An armor LT is expected to be and expert in armor. An aviation LT? Well.... knowing your airframe is secondary to other stuff. Becoming an IP (instructor pilot), is very rare for commissioned officers in Army Aviation. Flying past the rank of major also becomes rare unless you are a BN CO.
On the Air Force side it is different. You are a pilot first, a leader second, though many in the Air Force might disagree with this. It is not unusual for Air Force LT's to become IPs. Heck, some even are IPs at their flight school (Army IPs have to have at least one assignment under their belt).
But as a pilot in the Army you get to rub shoulders with those you support. You are at the same FOBs. You eat chow together. If you fly transports you see the faces of those you carry.
As pointed out to the OP, know the jobs other than aviation in each service and think about what you wish to do. Even as a pilot in the Air Force you might find yourself as a UAV operator or sitting at a desk. Flight school slots come and go. Some years they are plentiful, some years scarce. Don't dwell on the worst case, but also consider what you want to do with your service.
Good luck to you no matter your decision.