I would have said the IR3 would be better.
As Dave said, neither gun is more accurate, i really wouldnt agree that the mag is more consistent.
Also both guns have their own gadets to acheive ridiculous rates of fire without chops.
However the angel is a much more stable firing platform, meaning not only can you put 20 shots in the air in 2 seconds, you can actually hit stuff with them too.
Plus you are buying British, which guarantees quality of design.