I use MS Office mostly to ensure I can open any Office documents our clients send us.
Besides the App Store, as Phil0124 mentioned, you can get Office 365 directly from Microsoft. There's not a thing different about them. Only where you purchase it. If a single license is all you need for home use, $70 is pretty cheap.
Consider that the perpetual license versions come out about every three years. Office 2019, with Outlook included, is $250. Pretty much a wash as far as price compared to the least expensive choice for Office 365. Plus, you can continue to use Office 2019 for as long as it keeps working for no extra cost.
Where it makes a big difference is the moment you want more than one copy. The $99 per year fee for six computers with Office 365 is a far better value than getting individual licenses for Office 2019. When you figure a perpetual license release is going to happen roughly every three years, $300 is much, much less expensive. If you were to purchase six Home version editions of Office 2019 (the one without Outlook) at $150 per license, it would be $900. For the Home and Business edition with Outlook, it would be a whopping $1,500! Then you'd spend that again about three years from now if you always get the latest release when they become available. Even installing Office 365 for only two Macs is cheaper than the perpetual license Business edition.
But it all depends on what you need and want to spend.