Blue would be good!
171 might be more popular though from the historical angle, the V class were restricted to the GN mainline whereas the S had wider route availability as well as a wider range of liveries: GN green, GN black & GN blue as well as UTA lined black. The V class had only two liveries (open to correction!): black with original boiler and then the classic blue with belpaire boiler. Am sure they would have looked fab in the UTA lined black but I don’t think any of them carried that livery?