Canola oil is certainly the healthiest cooking oil when cooking foods.
Canola Oil is lower in saturated fat and high in monounsaturated fat which can help improve your cholesterol levels and reduce your risk of developing heart disease.
Eating too many deep fried foods or any food cooked in oil is not healthy and can lead to heart disease if consumed too much but if you eat fried foods then do cook them with Canola oil instead as it's healthier for you.