I don't think it is smarter, but I do think it has the chance to be a hardier chick.
If you think of it, a chick hatched under a broody only needs the hen's warm protection every now and then. Otherwise, one will run around even in the frosty cold of winter, and still be fine. Plus, a chick under a broody does not rely so much on chick feed, but more on what the mothering hen shows it. The hen shows it how to survive off of bare minimum quite well too.
A chick in an incubator is automatically put into complete warmth and given food automatically. It is like the "city kid" - No knowledge of the cold world outside, no knowledge yet on how to forage for other things, and no need to go searching for food or water. If put out in the cold world, it would be confused, cold, hungry, and likely die early.
I've had a broody hen raise six chicks by herself, I only gave them a handful of chick feed once a day for their first week or so, then they began to learn how to eat and survive on their own, free ranging and sleeping out in our large property. Not a single one died or got taken by a predator, and not a single one became underweight or stunted in growth. In fact, they're of laying age now, and believe it or not, this photo is of a hen that only eats what she can!
That being said, no, I would
not recommend doing such. Without the proper yard and with unpredictable winters, and especially if you had more chickens than just a few, you could starve and kill them. But, as a beginning for the chick, it is a great start. All my chickens except the photographed hen and her sisters are given feed and water daily, but even they I'd prefer to have raised under a broody,
then get fed normal feed and water like any other hen/rooster.
The only reason I don't offer these few hens constant food and water is because they choose to run around loose, out of the access of food/water. They still do get it, but they find it on their own.