But Anakin has never killed a family member. He never killed Padme (well directly) and he wasn’t able to kill Luke. Kylo through great strife was still able to kill Han.

Also a big difference between the two is that Kylo Ren is sick in the head whereas Anakin was a pompous ass with anger issues. Kylo Ren talks to the brunt helmet of his long dead grandfather and he speaks about himself in 3rd person. And do we even have to go into his violent outbursts? This man needs help and that can be a deciding factor as to whether he stays in the darkness or not.