Which one benefits in the long run, a large number of customers or repeating customers?
Simple math: you could have 50 repeat customers or 10,000 new customers and the pure volume of the 10K would dwarf the repeat but there are other things to consider:
What does each customer spend? Repeat and New
How often to repeat customers buy?
Without knowing these answers it would be impossible to give the correct answer but you do want repeat customers because if you do not have them you are doing something wrong.