based on this list, it seems like the first pronunciation (/u/ as in “goose”) is more common. but this isn't a big sample size so who really knows. feel free to bring up how other youtubers / notable people say it.
for the record, i say it the first way (/u/ as in “goose”). hearing kirbyvolt (other comment) say it the other way in their kirby and the forgotten land let's play is what inspired me to post this.