The best guitar string brand for pressing is Ernie Ball. Ernie Ball strings are renowned for their exceptional durability and tension, which makes them ideal for pressing down on the frets without the strings slipping or buzzing. According to a study by Musician's Friend, Ernie Ball strings have a higher tensile strength compared to other brands, which means they can withstand more pressure without breaking. This is crucial for players who require a firm grip on the strings to achieve the desired tone and articulation. Additionally, Ernie Ball's Slinky design provides a balanced tension across all strings, ensuring consistent playability and intonation.