Stored fields vs _source filtering in case of large source to fetch only one field while querying

Elastic Stack Elasticsearch
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To retrieve fields while querying, AFAIK, there are two ways to achieve in ES

  1. stored_fields
  2. source filtering

I have an index with source enabled where it has few large documents also.
While querying, I want to fetch only one string field(non-indexed field which doesn't have more than 50 characters).
Which one would be preferable to fetch the field in terms of performance stored_fields or source filtering?

I am in ES 6.1

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