Not necessary one is "better" than the other, as we have very strict control on tonewood selection, varnish used, to building method that applies to different series of the instruments.
From the making perspective, they are pretty consistent in terms of build quality and overall playability, if made under the same maker/workshop.
However, it is true that no two violin sounds "exactly" the same, even made by same luthier and used identical tonewood: this is why we record every single violin, using classical repertoire ( the best way to exam a violin's capability), so buyers can hear the subtle tonal difference between each instrument.