Which is better SA80 or M4?

you cant really compare them because M4 is a carbine ( barrel length between a SMG and a rifle), so a compact version of M16 and SA80 is a full length rifle. SA80 has a further effective range

I'm going to have to go with the SA80 its by far more accurate, of good design and was used by the elite, how ever the L85A2 is becoming more popular.