Resistance in push-in clamp contacts is a little higher than soldered contacts, and about the same as screwed ones. Consistency for push-in contacts is far far

Resistance in push-in clamp contacts is a little higher than soldered contacts, and about the same as screwed ones. Consistency for push-in contacts is far far better: Cold and sloppy soldering just doesn't happen, loose screws don't happen. Corrosion resistance is worse both for screwed and push-in contacts, but the push-in ones are self-healing: just wiggle it a little and it is fine again. Solder does also age and corrode, but very slowly. Both solder and screwed contacts are prone to loosen and break under vibration and movement (which shouldn't happen when wiring a house, but relevant e.g. for cars). You can do aerospace-grade soldering, which together with proper wiring design to reduce transferred force and vibration, will be sturdier than anything else, but also far far more difficult and expensive. Soldered contacts are also prone to degrade quickly when heated, e.g. when overtaxing a circuit or the (sloppily done) solder joint, which can happen at less than the circuit rating. Push-in clamps keep the contact pressure even with heat expansion, movement and deforming ageing wires. So there are specifics one has to be aware of, but in most cases, you want push-in clamps. Soldering is the only alternative, but isn't really viable without the proper skills of the worker and inspection of all solder joints.