For me, before I had access to merge two rings to one, I prefer to carry
Iridium Band &
Naplam Ring
I tried some other rings like Phenix Ring or Lucky Ring.
Finally I begrudgingly wear back Naplam Ring as it literally boosted my efficiency to deal with monsters and explode stones simultaneously.
Above is just my personal propensity, you can try them one by one until finding out your favorite.