The assets you listed are all very reliable and trustworthy but I would prefer Bitcoin and real estate because I don't really know much about aGold and I also heard that Gold isn't very easy to buy. Real estate (land) is the next oil well after Bitcoin and I've seen its worth over the years and investing in real estate is a good investment plan, Bitcoin on the other hand may be volatile in nature but it is also a decentralized currency and it is even more valuable than real estate so yes Bitcoin is also a good investment plan for the future.