[moucheur2003]

My first was a 6. Then I got an 8, then a 4, and there I stood for a while. Now I have everything from a 3 to a heavy 9 that does better with a 10 line, and multiples in many of them, but my favorites are still 6 and 4.

Leaving aside my own collecting history, I think a 6 is more useful than a 7, and a 4 more useful than a 3, so you'd need a 3-5-7 combo to do what a 4-6 combo can do, and you'd probably use the 5 most of the time anyway.