I do think both of them had a tragic life since their stories are similar to each other, but Snow White was almost killed twice, Cinderella was only abused, yes, it's also quite tragic, but at least she wasn't almost killed and even though we see Cinderella crying over her father's death in the beginning I think that Snow White had a more tragic life than Cinderella though Cinderella isn't as strong emotionally as Snow White is!

Both did though

Both.

Someone wanted to kill her...

Judging based off the movies, Cinderella just seems to have dealt with constant tormenting and cruelty from her stepsisters and stepmother. In Snow White, the Queen was watching Snow White from a distance in the only scene we saw of her. Cinderella at the very least seems to have been much more affected by her tragic life than Snow White. Of course, I wouldn't be surprised if Snow White actually had the more tragic life, because with her constantly cheerful personality, she'd just be able to deal with it better than Cinderella did (I do think that Snow White copes better with difficult situations than Cinderella does).

^^ Agree with AllegroGiocoso