If you put the lid on it and stack them on TOP of each other and don't nest them they take up as much space as carboys.
The whole scratched bucket thing is an urban myth IMHO though. Cleaned and properly sanatized there is no more risk of infection than anything else. Folks have used their buckets for years with scratches and no problems.
If you can afford carboys, and you like the blingyness, and you wanna see your stuff ferment, and don't mind the weight, the narrow opening and the danger of breaking them, then just SAY so.
Don't try to justify it by saying you are worried about scratches

You have to take more care trying not to break your carboy than it requires to not scratch a bucket.
Just Sat. morning I had filled a wine bottle with Apfelwein and it slipped out of my hand as I was moving to put a cork in it

What a friggin mess to clean up. And this was in the basement. I brew in the kitchen and have to carry my fermenters downstairs the thought of the mess a 5 gallon carboy full dropped in my kitchen or on the stairs or in the basement is enough to keep me using buckets.
I actually was offered by a friend who used to brew to use two of his carboys and a bucket he had since he wasn't going to be brewing anytime soon. I took the bucket but said no thanks to the carboys, I am just to afraid of breaking them.
I respect the hell out of you guys that do. I wish I could especially for non-beers like Apfelwein. But I am too dumb an clumsy
The problem I tend to have with buckets is the risk of stacking them up and with something attached to the outside gouging up the inside of the other that can harbor bacteria.
Glass is fragile and can break. But I also make it a point to stash them in a place where they're well out of the way. I find it's nice to make a daily task out of checking out how it's going rather than just having it out in the open.
As I have two small children the question comes down to really which one is less prone to potential damage. My theory is that with so many of their toys being made of plastic they see a bucket and gravitate to it. I've seen this when brewing; they'll come into the kitchen and won't touch the carboy because it's big and glass and they know thusly that it's fragile....but the plastic buckets with the "toddler could fall in and drown" graphic on it? Yeah....beeline right for the thing!!!