Shang is way better for utility; Masacre is a powerhouse attacker, and he has at least a small defensive value (compared to Shang's almost-zero defensive value).
However, thinking of the future: whilst both are available as 7-star champions, Masacre is only ordinarily available by completing multiple Carina's challenges and choosing him from a selector.
Whilst he might show up in occasional special crystals, I suspect Masacre will remain relatively inaccessible as a 7-star, for the foreseeable future. Hence, his 6-star version has better longevity.
So, for long-term value, I'd go with Masacre; as he's not going to become out-dated by his 7* version unless you want him to.
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Shang is way better for utility; Masacre is a powerhouse attacker, and he has at least a small defensive value (compared to Shang's almost-zero defensive value).
However, thinking of the future: whilst both are available as 7-star champions, Masacre is only ordinarily available by completing multiple Carina's challenges and choosing him from a selector.
Whilst he might show up in occasional special crystals, I suspect Masacre will remain relatively inaccessible as a 7-star, for the foreseeable future. Hence, his 6-star version has better longevity.
So, for long-term value, I'd go with Masacre; as he's not going to become out-dated by his 7* version unless you want him to.