We've lived in Sammamish since 1988 and have seen lots of growth and change. The two schools do have different personalities, but are both great. It's a bit like selecting rubies versus sapphires. Both are precious and valuable, some people have differing tastes.
Skyline is known to be academically very challenging and for some students this is stressful. Others shine under the pressure. Eastlake is outstanding academically too, but not known to be quite as demanding. Both schools turn out lots of top graduates who go on to great universities.
Our oldest graduated from Eastlake in 2008 and was very involved with music & drama. He had friends in all the sports and they have done well too.
One resource regarding test scores is the Washington State Report Card. I have it linked below comparing both schools.
We know lots of folks with kids at Skyline and Eastside Catholic too. If you want to tell us more about what characteristics are important to you, we might be able to make a better suggestion.
Welcome to Sammamish.