I need to purchase an instrumentation amplifier to amplify a voltage drop over a shunt resistance, which should be around 6mV, to 5V (or 1.1V if I decide to use the internal reference of my Arduino Mega). I found 2 affordable alternatives: AD260 and AD263. I am using this to calculate the short-circuit current of a 0.5V/6A cell. Would any of these definitely be a better choice or would both do the job accurately? Thanks!