Where is the best please to do data aggregation for UI in microservices architecture.

I am building a application using microservice architecture. It has five Rest API and one UI(single page application) microservices. Please find digram.

Could anyone advice me which is the best option to do the data aggregation.

1. Make UI application as static web application and do all API request from front end (from browse using javascript framework) and all data aggregation do in front end itself and render ?
2. Make UI application as dynamic web application and do all API request and data aggregation in web application back end ?

Please share you expreance and though.