In general More partitions lead to higher throughput. But few things to consider - more partitions means consumer has to have higher memory system to consume data.

Interesting articles I found about it

• https://www.confluent.io/blog/how-choose-number-topics-partitions-kafka-cluster/
• https://engineering.linkedin.com/kafka/benchmarking-apache-kafka-2-million-writes-second-three-cheap-machines