Secondly, in terms of effect, Pilates will be faster.
Let me talk about the principle. The core of reducing fat is that consumption is greater than intake.
Doing exercise to reduce fat is to increase consumption and reduce intake.
It depends on what type and movement you do when you do Pilates and Yoga.
Pilates is not as easy as yoga. Yoga is not as easy as Pilates. That's it. Do whatever costs more.
Of course, the two sports have different pertinence. In my opinion, Pilates has high requirements for the core and consumes a lot. Yoga requires more physical form, and carving muscle lines is more effective.
However, if it is to reduce fat, I suggest giving priority to strength training, interspersed with Pilates and yoga. Combine rigidity with softness. In the bottleneck period, you can change the master-slave relationship and make a slow transition.
Finally, no matter which exercise has a good fat-reducing effect, it is only a matter of speed. The only thing that bothers you is not what kind of exercise you do, but whether you can keep exercising for a long time.