My favorite record are probably Bible Records. I'm lucky enough to have access to a family Bible on my direct maternal line. I was also given a Bible with family information for a family that branches out to touch mine.
Why do I ♥ Bible records? For two reasons: they provide a lot of information but must also be puzzled out. When you have Bible records, you have a list of names and dates, often jumbled together and lacking relationship information. You could have a page that lists Grandchildren, Parents, Children, Grandchildren, Nieces, Nephews, Cousins, etc, all on the same page. Now you have to figure out how these people relate to each other. It's a challenge, which can be both fun and frustrating. But in the end, I'd much rather have the Bible and not be able to identify some people, than to not have the Bible at all!
I also hope that by deciphering the Bible entries, that the Bible will be helpful to other researchers. There might be someone else researching the same line, that would find the information extremely valuable. It's always nice to be able to help someone else!
One thing that I would really love to have happen, is to make a connection to my Smith line, which is partly covered in my maternal line family Bible. I've yet to connect with anyone who is researching my Smith line - which is brickwalled with Richard T. Smith (1829-1920). I'm really hoping that putting the family Bible out there will help me connect with fellow researchers. *fingers crossed*