Texturing technique question

#1

I have a model made up of many parts that will be a product render. What is the preferred method to go about texturing

a) Combine parts into a single mesh that share similar materials and UV map so I can use a single texture files

b) Leave the parts separated but still use one texture to serve all parts

c) Leave the parts separated with one texture for each part

Are all of these valid depending on use case?

Thanks

#2

do you have to use just one texture or could you use UDIMS?
I tend to use one object and use masks to define materials in texturing

#3

I’ve always just parted everything out with their own UV mapped textures.