I like twigs (whips). I can prune and shape them to my liking better and with horizontal branch bending i can have fruit a little earlier on most of them. However i dont want 25 feet trees myself. So im ok fooling with them and 3-4 years is fair to me. Even though many fruit earlier. I have some in pots now waiting to be planted in the Fall that fruited this year.
This is all that i personally want or desire out of each tree… but i do understand that some want/need more.
Drew also makes some points about fruit quality vs quantity etc.