Measurements can tell you if a loudspeaker will be dreadful, but a lot of care & understanding is required to obtain measurements that will help. Stereophile often presents loudspeaker measurments but the most telling were cone displacement/distortion displays obtained with sophisticated instruments. This is not DIY stuff. So.....

Attend a lot of acoustic concerts/recitals (recitals are better) to learn how real instruments, as opposed to instrument amplifiers with their signal benders, really sound. You can usually remember real sounds far longer (i.e. years) than you could ever remember how one speaker sounds w/r/t another. Most of us can identify our parents' and sibling's voices on the phone before they identify themselves.

Then listen to comparable music played through the target loudspeakers and you should know which loudspeaker is one that you can live with.