Our previous camper had a manual awning, our current one has an electric awning. The manual awning is stronger than the electric. We use awning tie downs to secure our electric awning when it gets windy. Without it, the awning moves with a slight breeze. The only time we use the awning tie down is at our seasonal site since we camp across from a farm and it is always windy.
If where you camp it isn't usually windy, the electric awning will probably be fine and the convenience of an electric is great. Just make sure if it doesn't have the ability to be pitched, that it automatically sheds water. That's important.
-Michael