Preheat oven to 375 degrees. Place pears and quinces in 2 separate bowls, and squeeze lemon over pieces (fruit will brown slightly).
Melt 2 tablespoons butter in each of 2 large ovenproof skillets over medium-high heat. Add pears to 1 skillet and quinces to other skillet. Divide sugar, tangerine zest, and vanilla pods and seeds evenly between skillets. Cook for 5 minutes, tossing. Divide tangerine juice and wine evenly between skillets.
Transfer skillets to oven, and roast, basting often with pan juices, until fruits are tender when pierced with a sharp knife, about 30 minutes for the pears and 1 hour for the quinces. Combine fruit, and serve warm or at room temperature with vanilla-bean creme anglaise if desired.