Ok I've always heard that sprints bounce more than routers. What does that really mean. For example:

You have horse A and horse B, and we know that horses tend to bounce off tops, only time they might not is a 3yr just pasting their 2yr best and lets say thats what both of these horses have done.
They both have tops of say 8.2 for their 2yr top, and say they just ran a 7.3 in their last.
1. Horse A just ran his 7.3 in a 6F race and now is running in a 8.5F race today.
2. Horse B just ran his 7.3 at 8.5F and now is running at 6F today.
Who would have the greater change of backing up??? Is it the running of the sprint that does them in or the day that they run in the sprint??? I hope I made my self clear on this topic. Thanks............