One thing, but it is a significant one: the full sample range, in your hands, in daylight. Photographs cannot tell you how a Swiss lace front disappears against skin, how much heavier a silk top feels than a mono, or whether a 40% grey blend actually matches your temples. Fifteen minutes with the samples settles questions that three phone calls do not.
Everything else is identical. Templating, hair matching, fitting, haircut, re-bonding and repairs all happen at home to exactly the same standard, with no travel surcharge anywhere in our radius. Most clients do the first consultation at a studio and every visit after that at home — which is the combination we would recommend.