"It depends": Beanstalk is a bit like training wheels with regards to auto scaling, load balancing, and high availability. If you/your team are new to those concepts as applied on AWS, then EB can make it a lot faster to get a solid environment up and running.
Downsides are that failing deploys can get wound around the axle pretty easily and you can be sitting around for 30 minutes waiting for everything to go green so you can try again.
Also check out AWS copilot on ECS as another, perhaps more current, form of training wheels.