Replace some Rock siding to Vinyl ???

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Hello. I am working on a flip and I am replacing siding on the home along with all the windows. This home has some kind of rock stone siding at the bottom part of it . Should I leave that alone or replace all siding to newer vinyl siding. My first thought was to leave the rock there to give the home sole character, but some contractor told me to tear it all out and replaced with all new siding because it it dated .