Again I have to say it depends on your DD.
I think they cannot join Brownies until 7
They can join Beavers at 6
My DD went to Brownies, my DS went to Beavers
At Brownies it was always hall-based - they would do cookery, make up plays, make things. A sleepover was arranged in the hall but DD didn't want to go.
At Beavers they go on hikes, catch trains to nearest town, couple of sleepovers in hall and a lot more outdoor activities. There are a few girls but they are outnumbered.
So have to say it depends on your DD whether she enjoys or would enjoy outdoor activities and putting up with boys or whether she prefers a quieter all girl environment.
Just have to say I am not in your area so cannot comment on the groups you have mentioned.
However, just to say DD got into Brownies straight away with hardly any waiting list. DS was on the waiting list for Beavers for 7 months.