Apple iPad 4 Wi-Fi + Cellular or Apple iPad 3 Wi-Fi 3G, Key features and differences

Apple iPad 4 Wi-Fi + Cellular or Apple iPad 3 Wi-Fi 3G, Key features and differences : iPad 4 Wi-Fi + Cellular over iPad 3 Wi-Fi + Cellular, Both phones compared by their Dual-core, 1 GHz Cortex-A9, 1536 x 2048 pixels, 9.7 inches, Dual-core, 1 GHz Cortex-A9, 1536 x 2048 pixels, 9.7 inches, Screen Resolution, GPU, Memory, Storage, Alert types, 3G etc.