H1b extension regular vs premium

Hi friends ,

My current h1b visa expire in dec 31 2018 and my employer about to file h1b extension and they are suggesting to go with regular. please need your advice should i prefer regular or premium.

Details : extension with same client and same location , same employer
EVVC model (end client is state client)
provided all documents (end client letter , vendor letter, prime vendor , complex and specialized duties with % etc).
soc code 15-1132 (as i am developer)
Background : bachelors in ECE and masters in software engineering ,
please provide your inputs.