I use AWS for other things and so I already had an account with all the billing things configured.
From a Sagemaker point of view I do not know enough to tell you if it’s better than Paperspace.
There are many “short-cuts” that AWS provides for you that may reduce the time spent in maintaining an ML network. Also with the new pricing reductions for a p2.xl is $0.90 an hour.
You might find that you’ll develop on Paperspace but then run production workloads on AWS.