For O maps it really doesn't matter afaik: The offsets between those two are well within the line thickness of the thinnest ISOM/ISSprOM symbols...
More important, probably, is the choice of UTM zone: You cannot have a zone change in the middle of your map, or if you do then you have to select one and transform all the data from other zones into this target zone.
Here in Norway we use WGS84 for everything, but UTM 32N, 33N or 35N (no 34!) depending upon how far east you are. This is effectively a north-south split since Norway lies at slant, so that we use UTM32N for everything from our south cape (Lindesnes at 58 degrees N/7 East) up to and including Trøndelag at around 65N/14E. At the county border between Trøndelag and Nordland we switch to 33N and since this is nice orienteering terrain (https://mapant.no/?#8/65.418/13.392
) any map maker here has to make a choice between them.
I am guessing you will get into the same issues along the borders of all your various State Plane zones?