Restore api vs custom copy script

I have a secondary index storage where I have both snapshot (taken from ES
server) and valid lucene index (content is same as snapshot). If ES server
index is cleared/deleted though the mapping is retained, could someone tell
me which is the better option to restore in terms of time taken:

a) restoring from secondary index storage to ES using ES restore api (
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-snapshots.html
)
b) using custom coping technique (scp, ftp like) to copy lucene index from
secondary index storage to ES

Thanks,

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