Comps on up/down Duplexes?

[Richard M Rajchel]

I'm a new investor with an LLC, about a year of research and practice underwriting/analyzing properties. I am focused on BRRRR to start out and it seems to me there are a number of upper/lower duplexes in my area(Wisconsin) that seem to work out very well number-wise if I just purchased them outright and got some leases in place and financed them. I would however like to BRRRR them and while I have lots of people to lean on for financing, contracting, and getting mostly accurate numbers on the front end, I'm having trouble looking for comps to price these properties out for ARV.

Do I compare them to similar single family homes(4 bed, 2 bath, 1750 sq ft. 2 stall garage)? Do duplexes comp out differently? Any help would be greatly appreciated. Many of the properties I'm looking at are in small towns of like 10,000 or less population so there isn't a lot to pick from for comps.