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I have had many, many clients close through Guaranteed Rate over the years. Every pre-approval resulted in a closing with Guaranteed Rate.
However, with Quicken Loans, I have only had one person actually get closed through QL. All the others that presented pre-approvals from QL failed to close with Quicken.
That is my experience with each of those lenders as a Realtor.
One more thing: IME many QL appraisals come in below sales contract price. This can happen with any purchase, but it seems to happen more often with QL. There were several buyers denied at the last minute with Quicken and they were able to go to another lender and actually get the mortgage. So it isn't a buyer issue, but a Quicken Loans issue IMO in some instances.
GR > Quicken