Like most things in relationships, this is very individualized. There are some benefits to both. On the side of living together The obvious being that it is a bit of a test run of if you can spend that much time with the other person and live with them 24/7. Also if your living habits jive. It doesn’t hurt to pay some bills together before the big day as well. On the other hand, you don’t necessarily need to live together to find some of this out. You may live separate but spend almost every waking moment together anyway, and spend enough time with each other sharing each others space that you have a good idea how it will be. You can also share payment on things or other responsibilities without living with one another. The biggest plus to not living together first would be the excitement and change that once you are married you are then together.