ADo you mean knife to tort the cake? I have an 18" Wusthof serrated. Weight depends on how comfortable you are when you're holding/using the knife.
Oh, no, not to tort, but to cut wedding or b-day cake. I attend many wedding at my church and see people cut and serve cake with wedding serrated knife & server set. Cake practically crumbles under that knife and it is impossible to cut clean and even pieces.
ABefore you have them go out and buy another knife, just instruct them to clean the knife with hot water and wipe dry between each cut, still slicing straight down. That may work well enough. I use both chef's knifes and straight cake knives. I have used a serrated straight one. I don't see too much difference between them. The cleaning with hot water I think is the biggest help, although time consuming. And mindful to keep the water away from the cake.
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