I can see there are three out of box templates available by SharePoint named as,
- Enterprise Search Center
- Basic Search Center
- FAST Search Center
I created sites based on three templates, but I couldn't really see much of difference except when I try to search using FAST template I get this error,
The search request was unable to connect to the Search Service.
There isn't "much" difference between layouts but I would like to know if there is any major difference between the way they operate.
Its a fresh install and I used SharePoint wizard to install/configure all of these services.