Don’t know what to do with 15K

Fiancé and I are getting married next year. We have about 15K, for a house down payment or a wedding. Right now we live with my dad while paying half of everything, with our toddler, we’re 21. Fiancé is set on doing a house down payment, and I know it’s smarter and I’ll thank myself for not having the big blowout wedding. Half my family thinks house and small wedding, half think big wedding and move out after to rent for a couple years. But a tiny tiny tiny part of me thinks about using most of it on the wedding and then just moving out right after and renting a house, and doing house later on down the line once we’ve established credit. (Just got a credit card, we bought our car so no payments, we both have no score, but mom is willing to co-sign if we get a mortgage, but hopefully we will have some kind of score by then so she doesn’t need to), I just have no idea what to do. Fiancé thinks we should do house so it’s paid off earlier and dont waste money on renting. We are both leaning toward house and having a small wedding/party at the new house. Any advice welcome (just please don’t be too harsh)