Changing your diet is generally more efficient for weight loss than exercise is.
Consider, for example, a McDonald's quarter pounder combo with cheese and a medium fry. That is around 850 calories before we even get to the soda, which would possibly add a couple hundred calories more. For how long would the average American man need to jog to burn that off? If we take that jogging burns around 400 calories in 30 minutes, that means he needs 60 minutes of jogging to even get close.
Then, you have to consider that the meal doesn't have a lot of staying power. We've got protein and fat in there, sure, but also a tremendous amount of simple carbs between the bun, the fries, and the soda we excluded from the calorie count to be generous. With such a meal, it's no surprise at all if you're hungry just an hour or two later, making you eat even more.
And then consider that exercise is difficult to maintain as a daily routine. You have to eat every day. No getting around that (aside from maybe some intermittent fasting here and there).
An easier place to start is to cut out or cut down on high-calorie beverages like iced coffee drinks, soda, alcohol, and fruit juices. I lean toward kombucha and seltzers like La Croix with some occasional herbal teas. I also take my coffee black. This alone trims around 150-200 calories a meal or around 600 calories a day.
For your food, try to maximize fiber and lean protein. They are harder to digest, keeping you full for longer. Protein bars, while expensive, can be great in a pinch. Oatmeal can be bulked up a ton by turning it into a porridge with eggs added. Cottage cheese is a protein powerhouse, and it too can be added to oatmeal, or turned into a breakfast parfait with the addition of fruit. Instead of white rice, opt for bulkier grains like quinoa and farro.
As for exercise, something you can easily incorporate into your normal routine is best. I'm a big fan of walking or jogging on the treadmill while watching TV.