The decision to do cardio at the beginning or end of a workout depends on your goals. 

Cardio first: If your goal is to improve cardiovascular health or warm up before training, cardio at the beginning is ideal. 

This will raise your heart rate and prepare your muscles, reducing the risk of injury. However, it can negatively impact your strength training performance if you don't manage your energy well. 

Cardia last: If your goal is to build muscle or increase strength, cardio will ultimately be better. This allows you to focus on lifting weights without feeling fatigued.

 Additionally, after weight loss, your body burns more fat as an energy source, which is beneficial if you want to reduce body fat. Which to choose?

 If you want to improve, do it at the beginning. If you want to build muscle or burn fat, do it at the end. The important thing is to choose what best suits your goals.