I agree on all the above reasons for using the small band saw. But I want to add another reason.
I used oxy-fuel to cut metal prior to acquiring my 4x6 band saw. I had to turn on oxy and fuel, set regulators, drag hoses outside, cut metal (sometimes not so good cuts with shaky hands, old eyesight etc). Then or at end of day, roll up hoses, turn off oxy and fuel, bleed gas from hoses and close regulators. Then had to grind off slag (detrimental to tooling) and some metal to get closer to dimension. After buying my saw, I just walk stock to saw, measure, clamp in vise, turn on saw, and do a little clean up in the shop if its a large cut. And cut is usually much closer to dimension.
I bought the saw used and it was a great investment and its not even in real good shape.
I don't like angle grinders with cut off wheels, mainly because of safety reasons. I have had and seen some pretty rough kick backs when someone makes a mistake with them.
Chuck