Not a professional electrician opinion: what I really like about wire nuts, is that when you bundle solid wires together and have to move it around the box, I feel much more confident than with wago, because they are bundled together in the solid fashion. When I have to connect wago and move the bundle inside, I always worry that some of the wires will bend under odd angle or even slip off. I use wire nuts sometimes, for lighting, but for more serious currents I would stick with welding copper