Even though bucatini and perciatelli are not exactly the same, they can be substituted for each other. That's what I did the other day when I couldn't find any bucatini at the store. I picked up some perciatelli which, to me, looked closest to bucatini out of everything else.
The pasta dish came out really really good. This was my first time having perciatelli and since I haven't had bucatini, I can't really compare them taste wise. But I can compare it to regular spaghetti. In my experience, perciatelly is much more filling visually and literally. It is much thicker and has a very wholesome appearance when it's cooked.
I think this might be my favorite pasta of all time!