You can change either side for a SiC wheel so it's dependent on which side you ( prefer ) to use, are you left/right handed?. Bear in mind that SiC is mainly used for brazed on tungsten carbide tipped tools to be of any use, so if you use them often that's the set up you should be looking at. A lot of members have done away with the SiC wheel & replaced it with a wire wheel & have a generic Al Ox ( medium grade ) on the other end, horses for courses I s'pose.
I have SiC / AL Ox set up on my small 6" grinder & it's been very rare for me to use the SiC wheel apart from the odd touch up on a carbide tip that I use for cast iron plus the occasional touch up of a carbide tipped scriber that doesn't get a lot of use either. No doubt other members will cast their opinions to assist you with variations on a theme
George.