Electrician here. I own all 3 brands. They are all GOOD. Klein i prefer for alot of splices. The top heavy feel of the tool aids in splicing multiple wires and wires of different sizes. The weight also makes it a great hammer in situations. The cutters generally hold up the longest between the three. Rectangle cutout can hold a 3/8s nut and be used a 9/16 wrench in a pinch. Knipex. Balance and finish are unmatched. This tool is awesome, metallurgy makes it rust and corrosion resistant, round cut allows to cut heavy gauge wire. They cut very well. Ive cut 1/4 bolts several times, very minor depressions in blades occured still cut well. Gripping nose is slightly smaller than Klein. Channellock. A cheap USA made no frills tool. Probably cut the best but rubber handles slide off, the tool rusts pretty easily and the tool head is slimmer than the competiton, a big downside. If you need to splice 3 or more 12awgs your SOL, wish they would fix that. Channellock used to make wiremaster plier that the old timers swore by.

The Kliens with the Journeyman grips are $39.99 at Home Depot. Nothing holds up as well as the Klien 2000 series. Not even the Knipex. You don't cut wire all day long barely squeezing the pliers like your test. You did not cut any 6/32 or 8/32 screws. The snap of the Knipex wears on your hands. The Kliens eliminate that snap. Channel locks can not cut any screws and rust quickly. 25 five years in the trade. Had numerous pairs of Knipex also that had too much daylight between the cutting blades. Can use the Kliens to remove knock outs hammering on a screw driver. If you do that with the Knipex the small pivot loosens and pliers get wobble in them.

Knipex 😍 , also Wiha makes some quality tools, I don't know how much they cost in USA, in Europe Wiha is cheaper then Knipex 😊

Your bias is showing XD

I use a Harbor Freight "Doyle 9-in" pliers that for $18 I don't care beating the crap out of them. I also have a Tekton 9 in that are also pretty good but those are for DIY auto repairs. In the car's tool bag I carry a Wal Mart Hart 8-in.