Best method for valuation of small mult-fam (6 unit)

[Carl Fordyce]

I'm Trying to get some advice from the BP community as to what's the best way to do a valuation of a small multifamily building 've been considering buying a 6 unit multi family I currently have 7 units  that are all In the single family category I'm use to using the comp method for 1-4 units but being that the building is only 6 units would you advise using the comp method or the cap rate method to do a valuation of the building