However, over two years a subscription will have cost you $479.76 which is close to the price of a one-off purchase of Acrobat Pro 2020.
So as long as Adobe 2020 still works on future versions of Windows and macOS in two years time, you’ll save money over the long time by buying it.
An Adobe Acrobat Pro subscription does have other advantages though including integration with Adobe Document Cloud and Adobe Creative Cloud which Acrobat Pro 2020 does not.
Adobe Document Cloud integration (hence the “DC”) includes Adobe Sign for legally binding document signing and document management in Adobe Cloud.
Bear in mind, Acrobat Pro 2020 will probably require security and feature updates to work with future versions of macOS and Windows and there’s no guarantee Adobe will issue these for what is now a legacy product.