Its MUCH less about numbers and details than it is about the entorage effect. From my understanding, the entorage effect is a change in how you perceive the high depending on what kind of terpenes are present in the strain / phenotype.

For example, a really terpy, stinking strain with low THC% could produce a better high (for you) than a high THC flower with less / unideal (for you) terps. In my experience, THC% has little to no effect on how the bud actually hits, and is just juiced up as marketing lingo.

Put simply, and I know this is vague, but experiment and find what terpenes / flavor profiles you like, you'll find similarities in high between strains that have similar terps (i.e., knowing you really like lemon strains, citrus strains, etc.) Then buy what fits your tastes!

EDIT: I agree with WhiteOakBayou, its about finding the terps for you.