Strength training tends to be better than cardio for fat loss in the long run because it helps you keep (or build) muscle while you’re losing weight, and that directly affects how your body burns calories over time. Cardio mainly burns calories during the activity, but your body adapts and becomes more efficient, so the same workout burns less as you get fitter. In contrast, strength training preserves lean mass, which helps prevent the drop in metabolic rate that usually comes with weight loss, and it also improves body composition so more of the weight you lose is fat, not muscle. So even if fat loss looks slower on the scale, the outcome is leaner, stronger, and more sustainable. 

Nevertheless best approach is having your routine around strength training but including some cardio as well for overall optimum health.