Lived in Argyle, moved to Lantana, now in Double Oak. Three different ISDs with many friends that have kids in all of them. All good areas with great schools.
Argyle is expensive, the schools are growing fast, and lots of new (dense) development in Flower Mound will feed directly into Argyle ISD meaning it will look completely different in 10 years. For right now though, it's great. "small" feel with great teachers and admins. Depending on your kids age, it could very well be worth it. If they are elementary age, just expect that by the time they get to high school, it won't be the same ISD at that point.