It depends.
If you find yourself frequently using various pills, say, for speed or reload buffs - then getting a ring is much cheaper in the long run.
If you are not using pills, then not really.
Rings (like pills) give you certain advantages. a reload ring (Ares) gives you more DPS with any weapon, which can be really useful to do more damage than you are skilled to do so without penalty.
However, rings tend to be quite expensive, on the flip side, they *mostly* hold their value, as in, they aren't consumed like pills.
If you have the budget, and want the extra edge, then well worth it. Otherwise, don't bother.