Loligo Squid has a mild, subtle flavour, low-medium oiliness, and is dry with firm texture. The flesh is translucent when raw and white when cooked.
Illex Squid, also known as shortfin squid, has a mild and subtle sweet taste with a firm and meaty texture.
U10 and other such numbers are references to size. So U10 means that there are under 10 squids in a kilogram. The lower the number, the bigger the squid.