i have both the hookworms and the k-rads. similar but different tires
hookwork- BIG. it's a freakin' balloon, and the knurled sidewall means it'll never slip out from under you. pump 'em up to 65 psi, they have a thick casing and you'll have to put the hurt on 'em to get a pinch flat. but they're heavy, like over 1000 grams
k-rad- smaller and lighter. less rotating, weight. not quite as grippy on pavement, but much better (although not all that great) on dirt. by dirt i mean like hardpack dirt jumps, not mountain riding. the kenda tread doesn't extend quite as far as the hookworm, but i don't think there's many instances where that will be a huge problem. probably a pound lighter than the hookworms. i haven't tried them in the rain, but i'd imagine they're better in the wet than the hookworms.
i think the k-rad is a better all around tire. hookworm is probably better in the skatepark, but the k-rad is just more versatile. they're also cheaper, if that matters