I remember when Pollock came onto the international scene. He was fast! Yes - a tad erratic at times but fast nevertheless.
Later on he bowled 125 or there about. Accurate, yes, and he got wickets but wasn't more exciting than a wall clock.
The most exciting one was Donald because you never knew what you got. One day he destroyed everybody standing and then, truly, I thought nobody is better. The next day he would bowl pies, didn't get his run up right, looked awkward and one would search for the Donald of yesterday. After a while you'd write him off - which would be exactly the time he would bowl a spell that would make the Waugh brothers look like school cricketers. Fast, aggressive and without pity. I loved him - and loved to hate him ....
So Donald for the most exciting bowler - but if I had to choose which one I'd take in my team on day to day bowling performance it would be
Steyn. He has the right mixture of accuracy, aggressiveness, reliability and pace. If you have that the figures will take care of themselves.