well… ethically, I think it would be better to terraform rather than to modify ourselves. I mean, there are ethical implications of terraforming a planet, but to genetically modify ourselves seems much more extreme, and to me at least, wrong. Genetic modification on that scale, would lead to people modifying themselves or worse, their offspring, to whatever end they desire. At least with terraforming a planet you could argue that the universe is infinite, and therefore there are infinite other suitable planets, and you’re just using one, hehe.