The main advantage of white gold is that it’s usually cheaper than platinum. However, during uncertain times the price of gold tends to rise, as people invest in gold stocks. So currently, white gold could be just as expensive as platinum, if not more. A good jeweller will always be able to explain and track metal prices for you, ensuring you make the right decision at the time of your purchase.
The main disadvantage of white gold is that it is plated with rhodium to maintain its white sheen. White gold is mixture of yellow and white metals, meaning that it tends to have a slight yellow tint when left un-plated. Jewellers plate white gold jewellery with rhodium to ensure a silvery white finish. So although white gold is cheaper, it could cost more in the long run, as it would need re-plating every two years to maintain its colour.
The advantage of platinum is that it is a more durable precious metal than white gold. It is naturally more dense, and a purer metal. Platinum does not need to be heavily alloyed with other metals, a platinum piece of jewellery usually contains 95-98% platinum and about 3-5% palladium. Platinum is not easily scratched, and can be simply polished over time to maintain its sheen.
The only disadvantage of platinum is that it is usually more expensive than white gold, because of its rarity. However, during these uncertain times, the cost of both metals could change to become relatively equal.