Which method is the best way to load a map into the game?

Currently, I am working on the core game mechanics in my place, and I'm stuck with a decision. Do I load in maps using InsertService() or do I load them in by having the maps in my game already, and then cloning them into the workspace? Will the second method break any map scripts? Will the fact that the map is just sitting there in my game's ServerStorage slow down performance?

Method #1

local map = game:GetService("InsertService"):LoadAsset(13456733)
map.Parent = workspace			

if workspace:FindFirstChild("Model") then
	for _,ungrouped in ipairs(workspace.Model:GetChildren()) do
		if not ungrouped:IsA("Terrain") and not ungrouped:IsA("Camera") and not ungrouped:IsA("Folder") then
			local u = ungrouped:Clone()
			if u then
				u.Parent = workspace
			end
		end
	end
end
workspace.Model:Destroy()

Method #2

local map = game.ServerStorage.Map1:Clone()
map.Parent = workspace