Twin Peaks: From Z to A compiles the entire Twin Peaks series, including Seasons 1 and 2 of the original series, the Fire Walk With Me prequel movie, and Twin Peaks: A Limited Event Series (Season 3) that aired in 2017. You'll also get a long list of special features, including 4K versions of the original series Pilot episode and Twin Peaks: A Limited Event Series Episode 8.
Special features included in Twin Peaks: From Z to A:
 
The Missing Pieces: Fire Walk With Me deleted scenes
Behind The Curtain: Making of Footage From Twin Peaks: A Limited Event Series
Full-length versions of all Roadhouse Bar music performances
A Talk with Kyle MacLachlan and Sheryl Lee
On the Couch with Kimmy and Harry
4K versions of the Original Series Pilot and Twin Peaks: A Limited Event Series Episode 8
Additional special features from previously released Twin Peaks home video releases
 
In total, that's over 20 hours of additional Twin Peaks content. It's worth noting that the packaging for this Twin Peaks: From Z to A reprinting differs from the original 2019 version. The new run uses a plastic case rather than the premium fold-out box of the original, and it lacks the collectible art prints. This cost-saving measure probably makes producing the sets easier, which hopefully means this reprint run will have better availability, but it's less of a collector's item. Nevertheless, this should be your best option if you want an all-in-one Twin Peak set.