It is more encyclopedic. While Van Perlo is a collection of "tricks," Müller provides a structured curriculum. If you want to study the endgame rather than just solve puzzles, this is the superior choice.
1. For Modern Precision: Fundamental Chess Endgames (Müller & Lamprecht) van perlo 39s endgame tactics pdf better
If you want , stick with Van Perlo , but get it on Forward Chess for the best experience. If you want rigorous theory , go for Karsten Müller . If you want retention , go for Chessable . It is more encyclopedic
John Nunn is notoriously rigorous. The positions in Endgame Challenge are engine-tested to the extreme, ensuring there are no "dual" solutions or cooked puzzles, a common frustration in older endgame collections. If you want retention , go for Chessable
3. For Pure Tactical Grinding: Endgame Challenge (John Nunn)
They published Van Perlo. Their proprietary app allows you to tap the notation to move pieces on a digital board—vastly superior to a static PDF.