Multiple meshes or single mesh

So, I have a question for me to build a building should I make 1 big mesh or several small mesh?

Another question if I take a square from blender and use it to build in roblox studio would it have the same impact as doing all the construction in blender?

First Question: Several Small Mesh, if you going to reuse. I don’t know your purpose though…
Second Question: Yeah, really, but blender you can really adjust features of shapes and stuff (like vertices on cylinder).

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