I've been to
Legoland's halloween thing every year for the past 5? years. I barely started going to
Disneyland's last year.
Legoland through the years has made it from being family friendly to only kid friendly. At first adults and kids could do everything; costume contest and trick or treat and then it went from kids only contest but everyone could trick or treat and last year everything was only for kids :/ My family might skip it this year.
Seaworld's halloween party is really fun too. Especially the last day since they give you tons of everything to get rid of it!
Disneyland's is really fun but really restrictive. You can't wear some items or take in some props. There rules are very harsh and that's what has been keeping me away for so long.
Legoland is a lot more free. Disneyland would not let you do this!
That being said, visitor wise, there are so many creative and more variety of guests than at other parks
My little cousins love going to all of them, since they get to dress up at a theme park

I'm sure your daughters would love it