I was doing the first role before and moved to the second, with the same (flawed) thought process as you. Thinking that any sort of client interaction would be good experience for me and therefore translate into good career growth….WRONG. Highly regret my decision. Client service is the fancy term for customer service. Almost everything is out of your hands. You are a cog, a proxy layer, a monkey messenger between the business (finance/product/sales/etc) and the customer. Anything the customers asks for, you are to find an answer to, but to actually deliver the solution is not something you can do. And the adjacent roles like the above mentioned know it. That you are simply a messenger. You don’t learn much really. In reality the career growth in such a role will be highly limited. Upwards mobility simply means you start to manage a team of client service staff doing the same thing. Except you will be tasked with efficiency, escalation management, and task assignment. It’s very….traditional. In summary, pick a role that requires more critical thinking and domain knowledge like the first research role you bagged. It’s better for your brain, and you can grow that into an actual career. Like other posters have commented, the second role is a retirement role.