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Second that.
The parallel jaw Knipex (on the right) are the go to choice for pro mechanics. As you squeeze harder they grip the flats of the nut giving a much more secure grip. A million times better than an adjustable spanner.
I have seen bearings pressed into swingarms with these. :)
They're pretty expensive if buying retail but once you get used to them its easy to justify. I've ended up with 5 different sizes now and duplicates for the edc kit.
Parallel jaws are better for nuts and other square surfaces you don't want to marr or damage. Serrated jaws are best best for stubborn b*stards that you just want to get off no matter what and are maybe already rounded.