What's the best L C for Exporter and also for the Importer ?

THAT WOULD BE IRREVOCABLE LETTER OF CREDIT AND WITH CONFIRMATION.

Deferred LC in which there is condition for the Exporter at sight by paying nominal Commission or Interest (either by Importer or Exporter as agreed) is good for both Importer and Exporter, because in that case Importer has to pay at later date to Bank and Exporter gets money immediately at sight. Win-Win for both.

For me revolving LC, nothing better than a continous business partnership. 

Dear

For Exporter Irrevocable LC is better

If any changes (amendment) or cancellation of the LC (except it is expired) is done by the Applicant through the issuing Bank

In both cases Irrevocable L/C at Sight is the better option to work on as it safes both importer and exporter.

Best option for an exporter is Irrevocable LC from first class bank would be the best option for exporters and LC at sight would be good for importers

An irrevocable confirmed LC at sight issued by an Internationally reputed bank would be best option for Exporters.  

sight LC beneficial with new customer ,with running customer both sight & Usance benefical

SBLC for both if there is a repetitive operation

LC having Credit Terms : Sight