One is "Joint Tenants" and the other is "Tenants in Common". Honestly I dont know the difference between them very well to be able to explain here.[/
Joint Tenants means: you and I purchased a house together. If I die, the house will be sold and you'll get to keep 50% of the proceed while the other 50% goes to my estate. Split 50/50 = Community Property.
Tenants in Common... you and I purchased a house together. If I die, you get to keep the whole property. This term is also known as "Right to survivorship".