I absolutely recommend clipping one wing only.
Clip both, and they learn to flap harder and still get where they want to be.
I can usually keep my turkeys in between clipping one wing, and making sure they have food, water, and a dry, clean spot to be- even if their run is a bit muddy (we live in the PNW so mud is unavoidable if you don’t have the budget to cover all runs :/ ). We have 5’ fences, and, while some will get on the fence on occasion (esp if I’m behind in clipping wings), they don’t tend to go over and leave.
I have also culled birds that won’t stay in....
They teach the others to leave, and, if they go outside the runs, a predator will get them eventually - unless you can/ want to cover the runs w a roof or w netting.
I’ve finally come to the conclusion for the ones that consistently escape.... I’d rather send them to freezer camp than have them taken by predation and thereby increase my predation pressure....
I have some runs that are covered, but also have some groups that can’t be combined - and trees in some runs prevent me from really being able to cover them all (along w winter budgetary restrictions....)