This link from the MS support page should help. You can switch out of S into Windows 11 Home, at no charge,  and there are no benefits from system with pre-installed Home version versus a system upgraded to Home. However keep in mind that systems with S version are generally less powerful budget systems. Also with S version you are limited to apps in the MS store basically.  So if you plan on using the system for more than basic computing and running the programs that you want to use, then the Home version may be for you right from the start. Now one more consideration. You can upgrade to Home for free but you may want Windows 11 Pro. That is not a free upgrade. So it boils down to the intended use of your system. 
Hello I'm browsing the range of laptops and see that ones that ship with Windows 11 S is considerably cheaper than it having the non-S version pre-installed. I know (or at least from what I've read) you can easily switch out of S Mode to effectively have the full version of Windows so could I essentially save money by just buying a laptop with the S version of Windows? Or does the non-S version of Windows being pre-installed in the first place have additional benefits over a S version pre-installed then switched out? Thanks
Windows 11 S vs Non S Mode