I think it really depends on which type of games you play. If you want the authentic feel of the 80's and don't mind a little adjusting of the leaf switches once in a while, go with leafs.
If you play mostly later games or you want a button or stick you can just pop in and forget about, go with the microswitches.
Leaf buttons have a more bouncy feel to them because they have in reality 2 springs- a spring in the button (like a microswitch button) and the leaf switch itself which acts as a spring. So on a game like Defender, using leafs on the thrust button, you can float your finger on the button alternating from on and off smoother. On microswitch it's either press button for on, release button for off.
I'm sure there are many games where the action of microswitch buttons give you an advantage, so its all a personal preferance anyway.
I'm not familiar with leaf joysticks being any easier to customize from 8-way to 4-way. Both leaf and microswitch that use that little plastic cylinder on the bottom of the stick to switch from 8-way to 4-way make a poor 4-way. The Japanese microswitch 8-ways with rotating plate on the bottom make the better 4-way switchable (but its still not perfect).
I just read that you have small children. Your right microswitch buttons would be a better choice then.