I use all three - for different purposes.
Cool Whip and Reddi Wip I use for instant splash on cake, ice cream etc.
and heavy whipped cream for baking, cooking, desserts that are homemade.
Yeah, instant access is not always the best option. I buy that stuff rarely, so once in a while I can splurge....I do use heavy whipped cream more often and have it always at home.
Whip the cream until it's quite stiff, add 3 tablespoon poppy seeds, 1 tablesp. sugar, 1/2 teasp. cinnamon, and lemon zest (from half a lemon). Let the mixture cool in the freezer for about an hour and serve with fruits.