Which would you prefer dual sim or one sim card on your phone?

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There are many producers of cellphones making a dual sim right now. But still there are its advantages and disadvantages. The advantage would be if you have two numbers (Globe, Smart, Talk n Text, Sun and/or etc). It is an advantage because you don't have to bring two phones with you all the time since both numbers that you have are in one phone. But, the big BUT, there is one thing that causes it to malfunction, it is when you have a number that is the same however its network (Globe, Sun, Smart, etc) is not. My friend was using the dual sim cellphone and was once got confused to who he/she is talking with on the phone because it did not register. He/She knows that the numbers were included on the contacts but since it has the same number, the cellphone got confused.lol. So I would prefer a one sim card phone instead of a dual sim. How about you? Would you prefer to get a dual sim or a single sim card?