Scores: Halo Collar 4 7.1/10 · SpotOn GPS Fence 7.9/10
The SpotOn GPS Fence has marginally better GPS accuracy on large rural properties (10+ acres) due to its use of both GPS and US GLONASS satellite systems. The Halo Collar 4 is the better choice for most suburban and smaller-acreage users — it's less expensive, has better integration with Cesar Millan's training program, and the 4th-gen improvements to collar response time are real. Either colla...