It’s all down to personal taste really. I like 80-100 plus lights per foot of tree so we have an 7.5ft tree with 1000 soft white lights.
There are 100 mixed generic baubles minus a few breakages over the years, 30 wooden houses, 30 wooden stars, 30 metal stars then about 20-30 special baubles and ornaments.
Our other trees have as many lights but less baubles. The hallway one is decorated with about 100 decorations built up over the kids lifetime from nursery makes to ones they have chosen.