Lepracan because he seems to have a lot of magic there. Chucky is a man stuck in a doll that mostly knows only one incantation so as much as I'd like to say chucky id have to go with Lepracan
chucky would win, only because hes a an evil nasty spirit of course stuck in a doll, no matter how many times he dies, he always comes back for more and has more advantages,cos hes a little doll and more faster and smarter, have not seen leperchaun before, its why i say Chucky will would win out of the two, plus i like Chucky