The last iPod touch had the same cameras (720p and 1080p) and Wi-Fi (802.11ac) as the 6G. However, the 7G touch is faster with Apple's A10 Fusion chip versus the A8 and twice the RAM (2GB).

iPod touch 4G, 6G and 7G. While the 4G and 6G are now "vintage", i.e. with luck they will still have spare parts, the 7G is officially still being repaired (for a fee). The 5G, on the other hand ...