The return of "Maggi in a Mug" could be attributed to several factors that appeal to consumer preferences and trends:

1. **Convenience and Sustainability**: Using one's own mug is more environmentally friendly as it reduces the need for single-use packaging. This aligns with increasing consumer demand for sustainable products.

2. **Cost-effectiveness**: "Maggi in a Mug" might be priced lower than "Maggi in a Cup" because it doesn't include the cost of the disposable cup. This can make it a more economical choice for consumers.

3. **Customization**: Some people prefer using their own mugs because they can choose the size and type of mug they like best, enhancing their eating experience.

4. **Nostalgia and Tradition**: For some, making Maggi noodles in their own mug may evoke a sense of nostalgia or tradition, as it’s how they’ve always prepared it.

While "Maggi in a Cup" provides convenience with its ready-to-use container, "Maggi in a Mug" might offer benefits that align more closely with current consumer values such as sustainability and personalization. Whether it's nicer or not depends on individual preferences.