Comparing Contractor Estimates

[Ursula Lovings]

I was hoping to get some professional opinions and expertise.  I have 2 quotes for renovation work on a house.  One quote has the items listed, shows the price of each item as $0 and then has a final total.  I have no idea what the breakdown of each item is, but the overall cost is reasonable.  The other quote has the items listed but with a breakdown price of each item.  The total is higher for this one.  
Is an estimate with no cost breakdown a red flag? I know cheaper is not always better.  I'm concerned with being hit with a lot of "unexpected" costs as the project starts.

Any advice would be appreciated.

[Quentin Ambrose]

Quote from @Julie Garner:

Is it possible that the cheaper quote with the $0 does not include the materials?

 That's possible but I doubt it unless you told them you might pay for materials. Cheaper usually means

1. Misjudged the job cost (contractor error, usually results in asking for more money)

2. Desperate for the job (Usually results in asking for more money or unsatisfied client/using one job's money to pay for the next job).

3. Just being nice or that's just what they charge!