What do you prefer?

I like both, only thing I don't like about kettlebells is the feeling if I let go it may her someone else around me

Both build strength but they say kettlebells work more muscles which after using a kettlebell for the first time a handful of months ago in my new workout I agree I hurt more and felt like I'd done more.

What do you think?

I do both but I stick to dumbbells in the gym as I don't have any at home.
I do my kettlebell workouts at home as I too am scared of letting go of it in the gym!
I think kettlebells do well with working more muscles and I find that if I don't do a kettlebell workout for a while then I will ache a lot the next day after it! I find kettlebells the most effective for me but I like using dumbbells too