A lot of people seem to discourage "backstabbing" wires (whether those be stranded or solid) to receptacles wherein an inserted wire could later be released by pushing a flat-head screw to some kind of snapping mechanism.
However, I couldn't find a lot of resources about another type of connectors seen in some receptacles wherein wires are also "stabbed" but are secured by a clamp kind of similar to the ones in screw type terminal blocks.
With terminal blocks, it is usually recommended to first crimp stranded wires into wire ferrules before fastening them into the terminal blocks. Is this the same case for clamps in electrical receptacles; or could I just fasten stranded wires directly without using ferrules? What's the best way to connect stranded wires to electrical receptacles?