I have to second what Geeg has said.
When I only tipped, it was such a trial to repair a nail: remove everything and start from scratch. Whereas with sculpting; you prep, add the form, and build on what's already there. Takes less time and product.
Granted, when you first start sculpting, it's long compared to tipping if you're proficient at tipping (getting those forms on right is a 'trick' to learn). BUT once you are good at it, I actually think it takes less time than tipping.
I also prefer sculpting biters, but that's a personal preference. To each their own. I found it hard to tip them and blend on such an itty bitty nail plate. AND they can't have french tips without looking silly. Whereas using a CBM or a camouflage gel to extend the plate gives you more options.
Also, as Geeg says, no additional expense of tips and adhesive. Forms are cheaper than the two combined PLUS when tipping, you must have several different kinds of tips. AND tips don't sit well on people with flat nails.
BUT IN THE END:
I would hire the one that turns out the better looking nails that are less prone to lifting, no matter what their technique is.
Sculpting can always be learned.
I wound up teaching myself scultping through the help of tutorials and techs on this site and a few others.
hth's
