solr vs fts

Hi I have a question about tunning dovecot-2.2.36.x

Mail was stared in storage via nfs in MAILDIR via /home/us/username@domain.ltd/MAILDIR/ I use additionally local dovecot_indexes via SSD disk (/var/dovecot_indexes%h)

A few clients have 25K and more e-mail

I thinking about use solr like: fts = solr fts_solr = debug url=http://IP:8983/solr/ (solr in external machine)

Does it make sense ? use dovecot_indexes and fts ? What is the difference in performance?