The best type of hanger depends on the piece of clothing. Consider cedar wood hangers for sweaters, fabric padded hangers for delicate items, and sturdy plastic hangers for bulkier items.
Huggable Hangers are great, they don't take up a lot of space in your closet. Make sure you get some with strap holders for shirt with larger necks or tank tops. And you'll want soft or broad hangers for sweaters to avoid deformities in the shoulders.
The best type of clothes hangers are actually felt made or wooden, but honestly it does not matter too much. The hangers can be aluminum for all they care. It's all about how you wash your clothes.