to be clear my suggestions are based on experience from test and theoretical thinking.
centro is allrounder so what gun you should use depends in what range you gonna fight. its slow so using far range guns could be complicated when being catched, there is almost no way to use far range guns in close range with centro. Allround guns would be good for both ranges, bcs they have close range skills. Close range guns ofc would be good for close range.
centro can affect with vulnurability so guns with high skill dmg would be useful without their extra power skills, just example.