RE: To Rent or Not To Rent - Depends ?

Renting is the better option.
With renting, you have stronger cards and you have more power. So it's easy for you to enter Bronze I.
With stronger card, you can keep the win streak and earn more DEC.
The more you win, the higher rating you are and the more DEC you can earn (it's the compounding)

If you just simply play more matches, the ERC will be decreased and you earn less DEC each match.