Given a lack of health problems and if “occasionally” really means not very often, I think it best you use real sugar.
ANY of the artificial sweeteners might have a study come out any time about cancer, destruction of the gut microbiome etc. Unlike the real thing, they have not been in our food supply for thousands of years.
Someone without health issues can just take the risk-less hit of some extra insulin. (Risk-less only if carbs are not a slippery slope for you!).
Another question you should ask yourself is about satiation.
Is a real piece of cheesecake after a nice meal at a restaurant going to “satiate” that dessert desire for a month? If so, great, if not, and you actually probably will want more in the next few days - you might have the slippery slope problem.
But, does a home-made-with-sweet-chemicals piece of cheesecake actually feel like a dessert or just another attempt and fake food to avoid carbs? Is it just sort of sweet with a chemical aftertaste that doesn’t serve as a treat at all? If, on the other hand, it actually tastes great and you don’t mind the risk on the artificial sweetener - it is still an option.

Pleasure!
You have to read the list of ingredients carefully to be sure that you know what the product contains. Truvia is one of the brands that does this; there will be six different versions of stevia blended with something, right next to each other on the shelf, and only the fine print tells you what is actually in each blend.
(A treat for them and a treat for me!) Life has taught me that I cannot indulge in the sweet things often even the keto sweeteners --early in my keto journey I thought I could make “keto desserts” as a substitute, but discovered they slowed or halted my weight loss. Thanks for your input.