Almost every custom cake conversation reaches this fork, usually because someone saw a photo they loved and doesn't know which one made it look that way. Both are legitimate choices, and the right one depends on your design, your venue, and honestly your guests.
Buttercream
Buttercream is frosting: butter, sugar, flavor. It's what most people mean when they say a cake tastes good.
It's the better choice when you want the cake to taste as good as it looks, you like a softer romantic finish, you're doing fresh florals or greenery, or you want texture — piped rosettes, ruffles, combed patterns, a rustic semi-naked finish.
Its limits: butter softens in heat. A buttercream cake in direct August sun or a hot tent needs shade and planning. Buttercream also can't hold a knife-sharp corner the way fondant can, though a skilled hand gets remarkably close.
Kelsey works in 14 frostings — vanilla, chocolate, cream cheese, caramel, pistachio, cookies and cream, coffee, strawberry, peanut butter, triple berry, lemon, honey, toasted marshmallow, and cookie butter — so "buttercream" isn't one flavor, it's a menu.
Fondant
Fondant is a smooth sugar paste rolled into a sheet and draped over the cake, giving a flawless, almost porcelain surface.
It's the better choice when you want perfectly sharp edges, a completely smooth modern finish, sculpted or figure work, draping, bows, or precise geometric patterns. It also stands up to heat and handling better than buttercream, which matters for an outdoor summer event.
Its limits: taste. Plenty of guests peel it off. It also generally costs more, because it's slower and more technical to apply well.
The thing nobody mentions: under fondant there's still a layer of buttercream. So a fondant cake isn't a cake without frosting — it's a cake with a smooth shell over the frosting. Guests who remove the fondant still get a properly frosted slice.
The answer most people actually want
A hybrid. Buttercream over the whole cake for taste and warmth, with fondant used only where it earns its place — a sharp band, a monogram, a bow, sculpted flowers, a character topper. You get the finish you saw in the photo and a cake people finish eating.
That's the most common recommendation for a reason, and it's usually the more economical route too.
How to decide in one minute
- Outdoor summer event? Lean fondant, or buttercream with a firm shade plan.
- Guests who care about taste more than photos? Buttercream.
- Sculpted, character, or geometric design? Fondant, at least for those elements.
- Fresh flowers and a soft look? Buttercream.
- Not sure? Send the inspiration photo. It's usually obvious from the image which one it was made with, and you'll get a straight recommendation.
Have an inspiration photo?
Send it over. Kelsey will tell you what it would take and what it would cost — no obligation.
Request an OrderRelated: choosing cake flavors and the cake gallery.