Select No Weighting if you plan to use BEES to make an environmental claim.
For environmental claims, refer to the range of unweighted BEES results reported at the impact category level. According to ISO 14044:2006, a comparative assertion is an "environmental claim regarding the superiority or equivalence of one product versus a competing product that performs the same function." (Sec. 3.6) Weighting is the "process of converting indicator results of different impact categories by using numerical factors based on value-choices". (Sec. 220.127.116.11.1) Various weighting schemes are offered in BEES Online to help users interpret results. But for comparative assertions, ISO asserts, "weighting ... shall not be used in LCA studies intended to be used in comparative assertions intended to be disclosed to the public." (Sec. 4.4.5)