I have not used leppon , but on the forums people have mixed reviews . because its also being counterfeit made in pakistan . similarly about ZIC and KIXX products.
kixx is also good, if original. this is SN/CF fully synthetic so yes its good. But make sure to buy directly from authorized dealer and not from any shop or petrol pump. Similar advice for oil filter, just try to get good quality from trusted dealer/shop. Engine is one thing you don't want to compromise on.
P.S: I'm not a agent of "filter house" shop but its just that they have original / imported filters etc. I think they also delivery through shipment to other cities .. I don't know the charges though.