Buy or build tiny home for STR?

[Adrienne Bryson]

I will (hopefully if it works out) be coming into a bit of land soon. I'd like to put a tiny home on the property as a weekend getaway, and would also use as a STR. This would just be a 400-600 sqft 1-2 bedroom with just enough amenities to be comfortable.

Is it generally more cost effective to build a tiny home? Like, purchase a large shed, wire and plumb it, finish and furnish it? Or is it better to buy prebuilt? 

There'd be no time constraint at all, so I don't care if it'd take a long time to build. But if it's not much of a savings I'd just as soon buy one and have everything done.