If you all you care about is TB/$ you still cannot beat tape as long as you are using enough tapes.
It really depends how much you are talking about
this post was submitted on 27 Jun 2023
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If i remember correctly HDDs have a lifespan of about 50 years, while SSDs only 10. So I'd suggest you to buy an HDD
Magnetic media are still the best for offline backup. A good tape drive, or hard drives if tape is not your cup of tea. If you don't want a NAS, you can get a hot-swap SATA drive bay that allows plugging one drive into your computer at a time.
Recordable optical discs are a bit of a gamble for long term storage. Sometimes they last for ages, and sometimes they don't. There are some made for "archival" purposes, but those are generally expensive and as far as I know not exactly well proven. Another drawback is that you need a lot of discs, all of which will eventually become plastic waste.
Don't use flash drives for offline backup. Their charge decays when left unpowered, and your data with it.
Whatever medium you choose, be sure to make more than one copy, in case one of them fails.