Make the whipped ricotta: Whisk the ricotta and sugar together in the bowl until soft and creamy. Add the mascarpone or Greek yogurt and whisk again briefly, just until smooth. Place the fridge for a good hour to set, or until you're ready to serve.
Make the candied peaches: Simmer the water and sugar together in a saucepan until the sugar has completely melted and the liquid has formed a syrup. Add the peach wedges and lower the heat to a minimum. Let the peaches steep for 5 minutes or so, then turn off the heat entirely. Let the peaches come to room temperature.
Assemble and serve: When you are ready to serve, place a few good dollops of the whipped ricotta in each serving bowl. Place some peach wedges on top, along with a spoonful of their syrup if you like. To serve, sprinkle with some chopped almonds or walnuts, or some pine nuts.