If you spend a little time against the clock, you will find that you are measuring in hundredths of seconds.
With that in mind, a blunder that costs you a half a second is FAR more likely to cost you time. The type of gun has very little to do with it.
I have run quite a few times against the clock with a Glock, HK P7 and a 1911. They were all right about the same, with the Glock the fastest, and actually the P7 was the slowest. The P7 is the slowest because if you draw against the clock enough times you find that at it's fastest, it is no faster than the Glock, but at it's slowest, sometimes it is tough to get a grip on correctly, and that adds up in hundredths of seconds.
When you are going against stress, wierd things happen, and you grab for the gun at the wrong angle, or you grab a piece of your shirt on accident....all kinds of stuff can happen to cost you large amounts of time.
The few hundredths of a second difference between guns is really miniscule.
What adds up in time is your rig, and where you have your gun located, and if you have any baggy cloths on to get in the way etc.
I find a Glock to be the fastest, from a kydex holster. No matter how I grip the gun etc, all I have to do is pull the trigger. No levers to get a hold of and no safeties to find. Overall, they are about the same speed, but with every bit of complication involved, you add up more opportunity for you to grip the gun wrong or miss the lever.
Try it yourself and find out. Murphy's law goes full bore in these situations, and you would be surprised what you can fumble and cost a half second.