None....it's a fluid Dynamics issue, there will be a minute loss in brake fluid speed as it hits the bend on the first caliper enroute to the next...in an every millisecond counts scenario this could be felt... however; if you could feel the difference you should look for a sponsorOK, genuine question for the "Brains Trust" here.
The standard front brake lines on most bikes is 3 lines. One from the MC to a splitter, then one line to each calliper, or one to a calliper then a second line to the other calliper.
What are the real world advantages to going to a "race" setup, as in one line from the MC to each calliper?
Sent from my Pixel XL using Tapatalk