Brief Answer:
Stevia is preferable to sucralose.

Detailed Answer:
Stevia is a sweetener that comes from the stevia leaf, and is generally safe if used in moderation and small quantities, such as in tea of baked goods.

Mild stomach upset has been reported in some cases from stevia. Also, people who are allergic to plants in the plant family of ragweed, mums, daisies, and marigolds, can have allergic reactions to it.

There are different stevia products based on how refined and processed the product is. It is probably best to avoid the ultra processed versions such as the brand Truvia.

Because the research on stevia is relatively new, it isn't entirely clear yet what an appropriate dose range is for stevia.

Sucralose, on the other hand, is a chemically modified form of sucrose (table sugar) by adding chlorine to the sucrose molecule. In general, the body is not good at breaking down organochlorine chemicals. More long-term research is needed to see how the body handles sucralose, but it is not a naturally occurring sweetener like stevia. A study in 2013 linked sucralose to leukemia in mice in a dose-dependent way. The more the mice consumed, the higher their risk for leukemia.

If you are able to tolerate naturally occurring sweeteners (i.e. you aren't restricted by diabetes), natural raw honey, and dates (date powder) would probably be the safest.

But in moderation, stevia is likely safe, and if consumed just occasionally, or in very small amounts, sucralose is probably ok.

I hope this information is helpful to you.
Best regards,
Bonnie Berger - Durnbaugh, MD

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