Upfront cost: not even close
This is the headline difference. A quality above-ground pool can cost a few hundred to a few thousand dollars all-in. An in-ground pool typically runs into the tens of thousands once excavation, materials, and finishing are included. For most families, that gap decides the question on its own.
Installation and time
Above-ground pools go up in hours to a weekend, often DIY. In-ground pools require excavation, permits, and professional crews, and can take weeks or months. Container and modular pools sit in between — faster than in-ground, sturdier than a soft-sided above-ground.
Running costs are similar per gallon
Once the pool is up, the monthly costs — electricity for the pump, chemicals, heating — scale mostly with water volume, not pool type. A big above-ground pool and a similarly sized in-ground pool cost about the same to run. A variable-speed pump and a cover cut those costs on either.
Resale and longevity
An in-ground pool can add value to a home and lasts decades. Above-ground pools are removable and generally last shorter, but they carry far less financial risk and can move with you. Container/modular pools split the difference with strong durability and semi-permanent placement.