NCT has bad music but more charming idols. SVT has mediocre music but uninteresting idols. NCT has a better chance because you can change music but you can’t change personalities.
When compared to NCT, Seventeen are blessedly easy on the ears, I'd imagine the public would find them more accessible. They also have Seungkwanwho is on the way to becoming a TV celebrity. You mentioned Kick It, but I think Dream is more popular than 127.