I think you mean HOME switches. Limit switches do not worry about accuracy/repeatability--They just need to stop motion when limit of travel is reached. Actually, with a stepper system and mach3 soft limit settings, you could forego limit switches altogether.
Mechanical home switches need to be roller type and are only as accurate and repeatable as their mounts and trigger blocks are solid. Good roller switches solidly mounted and protected from chips/coolant are very accurate/repeatable.