The short version
For a group of eight or more, a private pool villa almost always beats a block of hotel rooms. One address, one pool, one bill, and nobody texting from three floors away to ask where everyone is. The bigger the group, the more lopsided the comparison gets.
A hotel makes sense for two travelers or four. Past that, the math and the logistics tip hard toward a villa. Here is the honest version of pool villa vs hotel for groups, using the numbers from Villa Azure in Jomtien, a nine-bedroom compound that sleeps eighteen.
