silver
silver is generally used in the photography industry, electronic components, coin production, decorative items and jewelry, alloys, and dentistry. it is also used in cloud seeding for artificial rain (silver iodide), mirror coatings, batteries, and wire production. humanity will always have a physical need for silver. gold, on the other hand, does not have such widespread industrial use. in the digital market, people mostly trade gold that does not physically change hands.
for this reason, not in the short term but in the long run, i think silver could become at least as valuable as gold.