They have less data and their process for crowdsourcing is not as good. For instance, I'm pretty sure google maps validates user inputs by email and by phone if that doesn't work.

I also have a suspicion they put in random data as a means of motivating users to "fix" it where it's wrong. I've gone to one restaurant gmaps has said is open and it's been closed and had lunch at a restaurant next door it said was closed which was open.

Neither one seems to be able to handle stuff like public holiday working hours, odd days off, holidays, etc.