My set up is identical on/off taps both feeding into a central banjo on the carb. Ride on the right tap only, from time to time opening the left tap to equalise levels in both sides of the tank. Then left tap closed, run again on the right tap alone.
Then when you're in the situation of needing the reserve in a hurry, right hand stays on the throttle while the left hand calmly opens the left tap, and you can relax......
So, with reserve type taps, my choice would be on the left. You need that right hand on the throttle.
A pair of cheap in line filters are also well worth fitting.
Swarfy.