Which, in your opinion, is the generally more effective one? Obviously a hypothetical, but it'd be fascinating (not least to me) what their respective strengths and weaknesses are.
Obviously, there are greats such as Lillee and Trueman who made side-on the fast bowler's orthodoxy for decades. Bowlers like Steyn and Jimmeh continue the proud tradition.
On the other side of the coin, there's Wasim Akram, Malcolm Marshall and lately Vernon Philander of whom all preferred to expose both moobs at the point of release.
So which one is more accurate? More swingy/seamy? More reverse-swingy? More inury-prone? More popular at various levels? Easier/harder to learn?