Double or Single Convex Stones?

Do you love double or single convex stones more?

I enjoy single convex:

1) Due to the flat bottom they have a stronger hold on the board and not as flimsy (for example when you accidentally knock against the board they won't wobble and get knock out of their position as easily)

2) Due to the flat bottom they have a larger surface area and resulted in a louder and more satisfying "clicking sound" when you make placement onto the board.

If you favor double convex what are your angle and perspective?