Generally, in HI industry more "comprehensive" means more covered services and/or better payment for covered services. However, I've always felt "comprehensive" was a nebulous term often thrown around loosely to impress folks about insurance products. Deciding how "comprehensive" any specific insurance product is really depends upon the individual situation, and the relative cost of the plans. It's wasted $$ to pay extra $100/mo ($1200/yr) to add, let's say, vision coverage with a max benefit of $1,000/yr. An HMO plan with a small provider network and no Out-Of-Network coverage may be quite "comprehensive" for young healthy adults with only routine health issues, but not for a complex cancer patient whose experienced oncologist is not part of that HMO network. And while maternity, contraception, and pediatric dental benefits may make a family HI plan significantly more "comprehensive" for a 20-something couple with 2 kids, those features would be useless for a single 60yo man.
IMHO- While Obamacare does require all "qualified" HI plans to meet certain basic requirements, it does not change the need for folks to look carefully at specific HI plans they are considering to see how they fit their individual needs (e.g. premiums, deductibles, OOP max, provider networks, and additional coverages like medical transport).