I know that the big producer such as Honda and Suzuki trial test multiple sets of tires to get the right road handling ability out of their motorcycles. The OEM tires that come on your ride are usually the best they have found to go with the suspension and handling characteristics of your motorcycle.
I for one never would change out an OEM set for a different tire. I ran Dunlops for 8 years on my 07 M109R when others changed them out and I never had the tires lose traction or do anything stupid on the various road surfaces. I ran curves hard with those tires without a whimper.
These original stone on my new bike are doing exceptionally well running curve and just overall very good road manners on every road surface I have had them on. I again see no reason to fix what isn't broken and is working correctly for the job at hand. Just my humble opinion.