The drawback of wearing clip-ons is that they can easily slip right off the ear but I find that the same can be said for regular earrings. I don't know how many times I've worn a pair of earrings and lost them. Either the backing fell off or they unfastened and fell off my earlobe.
I wouldn't say it's better to wear clip-on earrings because I just don't see fashion evolving where the clip-on earrings become dominant over earrings for pierced ears. However, for those who love to wear unique and bold earrings, it's a good idea to fluctuate the two because unique and bold earrings are often heavy on your ears. Of course we could just stop wearing heavy earrings but that takes away the fun of accessorizing!
STYLE TIP: I would suggest investing in a pair that you can wear with all your looks and that will last.