I don't have any experience with Acurite to make a comparison.
I will say that I have two different Ecowitt temperature sensors in the same physical location, and they don't show the exact same temperature. But I don't know how to quantify the difference.
Right now its dark out, so sun exposure is not an issue, and the sensor wired to my GW2000 (roughly equivalent to the GW1100) reports 74.8F while the battery operated standalone sensor reports 76.8. But as I recall, you can't count on the difference to always be 2 degrees. I don't have any kind of calibrated reference device so I don't know what the ACTUAL temperature is.
There is an option called "calibrate" that allows a + or - adjustment to the reported temperature that is simple enough to set up.