When you figure a perpetual license release is going to happen roughly every three years (per MS' history), $300 over three years is much, much less expensive. The $99 per year fee for six computers is a far better value than getting individual licenses for Office 2019. If you need to install Office on even only two computers (and with 365, that can be up to any six computers you want ), the subscription version is cheaper. It will work for as long as it takes a future release of macOS to break it. Like Office 2016, 2011, 2008, etc., Office 2019 is a one-time cost perpetual license.
If this is only for you, Office 2019 is your best bet for both price, and to ensure compatibility with your existing Office documents and those you need to send/receive with other users.
