The Speed has`nt got all the bells and whistles that the IR3 has, its basically designed for shooting fast with not frills, it has a different ball detection system too, it has SENSI as opposed to the COPS on the 3 (would tell you the diff, but I dont know)
Hope this helps..........oh and IMHO the Speed roxxors
I think it depends on wether you want an LCD Board or not, I dont want one, so I have the Speed, other people do want one, so they have the IR3 or are waiting for the new Angel "4"