there are four metallic benefit tiers (from least to most generous): bronze silver gold and platinum. check to see that the plans you are considering are all in the same tier (they probably are). the main factor that differentiates plans within a benefit tier is the provider network. if you have a preferred physician or hospital check to see if they are in each insurer's provider network. you many need to call the plans to find this information.
how should i choose between 3 insurers if the rates for both are basically the same on the exchange site?