In Jainism, there is no mantra considered better or higher than the Navkar Mantra.

It is regarded as the most important and most sacred mantra because it offers obeisance to the five supreme beings:

• Arihants
• Siddhas
• Acharyas
• Upadhyayas
• All Sadhus

The Navkar Mantra is not the name of one person or deity; it is a universal mantra of respect, humility, and spiritual purification. That is why in Jain tradition it is considered सर्वोच्च / the highest mantra for chanting.

So, as per Jainism:

• Navkar Mantra is सर्वोत्तम
• There is no better mantra
• Chanting it with faith, purity, and devotion is most beneficial

If you want, I can also tell you the meaning of Navkar Mantra or the correct way to chant it.