Who was Better Arjun or Pradyumna?

To find out the greatest warrior between Arjun and Pradyumna, First we have to know about who are they?

Arjun

Arjuna was the son of Indra, the king of the celestials, born of Kunti, the first wife of King Pandu in the Kuru Kingdom. In a previous birth he was a saint named Nara who was the lifelong companion of another saint Narayana an incarnation of Lord Vishnu who took rebirth as Lord Krishna.

Pradyumna

Pradyumna was son of Lord Krishna and 61st grandson of Adinarayan. His mother was Rukmini, whom Lord Krishna got from her father Bhimkashen Narayan and brother Bhimkaraya Rukmi. Pradyumna was born in Dvaraka. He was the incarnate of God Kamdev.

Now if you read Mahabharat you will Find out that Only Bhishma, Dronacharya and Karna are able to compete against Arjuna.
However, Lord Sri Krishna, Barbarika and Babruvahana are the only who have potential to defeat him.

so, is that Arjun is grater than Pradyumna? NO

Pradyumna was a mighty Maharathi warrior. He possessed the extremely rare Vaishnavastra which is the most powerful weapon in the universe. Also he was one of the very few people to know the secret of the Chakra Vyuha. But Pradyumna did not participate in the Kurukshetra War as he went on a pilgrimage with his uncle Balarama and other yadavas. thus, we are unable to determine his true strength.

therefore, we can’t compere these two warriors. they both posses Vaishnavastra and many more powerful weapons. However many will take sides of Arjuna because he defeated most of the powerful warriors in Kurukshetra War