Inferior to brass, but you can’t get brass anymore
My stove had been repaired in the past so it had 3 brass venturis and 3 aluminum. The aluminum ones take extreme care and good antisieze to stand any chance of non-destructive disassembly in the future.
Overall these are all you can get now, and the price here was excellent, shipping fast. The best thing to do in the future is NOT BUY A VIKING STOVE!