For a person with not much familiarity with Linux, and just wants to check things out, I would recommend starting out with a VM. WSL is good, but that is not the “Linux experience”. Moreover, if they are not already familiar with the command line, it may be a bit intimidating. The same goes for dual booting. It’s more technical, and it’s more appealing to just jump back into Windows when things go wrong on Linux. VM approach though, gives you a sandboxed space (with DEs and all) where you can smoothly get familiar and comfortable with Linux before making the final switch. That’s my personal opinion for beginners.