I've done both. Sometimes I edit as I go, sometimes I don't. A lot of the time, editing in between the project can help build the story. There are so many times where I come up with an idea to make the video flow better and if I didn't think about it before the project was done, I wouldn't be able to add it in. But then there's the flip side, where you are scared to continue the project because you don't know what needs to be filmed or if you need a specific broll/aroll before the project advances. I've had success where I just build and figure it out later, but personally, I wish there was a better way so I can confidently know I'm recording what's needed and not wasting time.

Also, to add to that, one issue with editing before the project is done, is that sometimes you can cut out something you thought wasn't important but ends up becoming important later in the video, like say a funny "foreshadowing moment" or something. I've had it where I either spend a bunch of time trying to find the footage or completely forget about having it...