Regarding the choice between American or Brittish, wich one you prefer is depending on you backfround, your future and your preferenses. If your kids are most likely to turn to US for University maybee it is best to choose ASD.

You seems lucky because it is not easy to be a newcommer and get your kids in these schools. That is nice and makes of course life very much easier.

One thing I would consider in you case, you will have your kids in these 2 different schools. They have different holidays, maybee this is not a problem for you though I would look very much in to this issue. It is hard during vacationtime when they finish at very different dates. Also one kid can have a week off and the other has to go to school..

Another thing to be considered is the transportation. Do you have a driver? Otherwise it will take much time to bring them to school and back. Traffic here is bad and sometimes it is hard to be on time. Especially when you need to take the kids to 2 different schools.

Good luck and again! Welcome!