I would agree that the jury is still out on diet drinks and heart disease, but it is pretty conclusive[1][2][3] that regular soda increases your risk of heart disease.

[1] https://abcnews.go.com/Health/daily-sugary-drink-linked-hear...

[2] https://www.eurekalert.org/pub_releases/2018-03/aha-dsd03141...

[3] https://consumer.healthday.com/cardiovascular-health-informa...