I would recommend them all but if you are more into the classical side of things then the first two albums are probably better for you, Fly Away is an American themed album with more crossover songs but there is still the classical side mixed in two. I Say get them all!
My favourite album personally is Into Paradise because it contains my two favourite songs ‘Sancte Deus’ and ‘Singing You Through’ but I love them all.
If you are into Jazz then Daisy also has a solo Jazz album ‘Simply Jazz’ which she released before All Angels.
'Fly Away' features music originating in America, as Dazza has said, so it might appeal to you. It gives more prominence to some of the solo voices but also has some gorgeous harmonies.
If you prefer the more classical side (like Jackie sings) then I would recommend 'Into Paradise' as your first purchase. It is also my favourite, and I expect you have already read some of what I have to say about 'Singing You Through'. It has been the defining theme for me this year.
Whichever album you listen to first, you won't want to wait for the others, so buy them all if you can.