I would say that to see Crested Tits you would be in areas that are perhaps not the best areas to have a very good chance of seeing Eagles, there is more chance seeing Eagles to the west of Scotland, especially on the islands. Islay has been mentioned as venue to see Eagles and I have seen Goldens there, I have found Lewis and Harris or Mull or Skye as better destinations to see both Golden and White tailed Eagles. There are Golden and White tailed Eagles in the Highlands/Cairngorms, but they are less often seen, I saw Eagles every day on Lewis, I don't see Eagles every month in the Cairngorms, sadly I think this is linked to disturbance on the shooting estates in the east.