Ditto to what Mark said, other than my monitoring preference is spl flat or C-weighted...pure preference....
One thing I would add if you are using multiple mics is to pay close attention to the manual's calibration instructions.
I didn't, and kept finding the SPL meters would read the same across all the mics I calibrated, but at the same time the RTAs would show different levels.
The reason is that Smaart will set the mic to 94db with whatever I/O device channel gain, that's being used.
However, the I/O device's actual output is measured as dBFS, and determines the relative levels of RTA and transfer traces.
So what I do is set dBFS first, prior to calibration.
Toggle the meter to dBFS. Turn the mic calibrator on, and dial the I/O device gain to a particular chosen dBFS. (I use -20dBFS for a variety of reasons.)
Then run calibrate in smaart. Now the mic will read 94db, and when you toggle the meter to dBFS, it will read -20.
Do this for all your mics on each of their I/O channels, and then all RTA and transfer traces will show the same level given the same stimulus....otherwise they won't!!
It's also important to set dBFS prior to calibration if your mic is in danger of running out of SPL measuring room...the little red clip light in the meter will let you know a bad...