I can tell you from personal experience of trying things I should not:
I did an occasional line of coke in the 80s. It was nice. That was it. I had no urge to run out and get more and I, in fact, never purchased any.
I was talked into taking a hit on a crack pipe in the late 90’s. It scared me half to death and I realized everything they said about it was right. I handed it back to my friend, wide eyed, and said “never again.” The friend and I parted ways over the crack shortly because it turned him into someone I did not know, did not like, and did not trust.
The bikers I associated with who did occasional coke did it… occasionally. The friend I lost to crack was because crack became his life.
Both the coke in the 80’s and that one hit of crack in the 90’s was from top end drugs.
So, personal experience said crack is more addictive than coke. I do not have an addictive personality but I can tell you that I knew that had I done much more than that one hit, I would have been hooked.