I prefer landlines. There is nothing more annoying to me than to receive a call while I am away from home or busy. I answer because I assume it might be important. If you want to chat with me, call my landline.
Many times, when I am phoning I don't care which family member answers, my message is for the family. Interrupting a particular individual by calling their cell phone seems rude (especially if they are busy) when I don't really need to talk to that person, just someone in the family.