Brand value and brand strength are totally defferent concept and high brand value does not nessessarily means high brand strength. The Brand Finance ranking table below is an example.
Source: Brand Finance Vietnam 50 2019
From the table, VNPT’s brand value (1 683 M) is slightly higher than Vinamilk (1 613). However, VNPT’s rating (AA-) is lower than Vinamilk (AA+). This indicates that VNPT’s brand strength is lower than Vinamilk.