Plank 40 Keyboard|||If you want both hands to fully cover all the keys while maximizing the number of keys for versatile use, then the Plank—also known as the ortholinear 40—is highly recommended.
It comes in several configurations: a full 1u layout with 48 keys, a single 2u spacebar version with 47 keys, a dual 2u spacebar version with 46 keys (as shown in the picture), and a dual 3u spacebar version with 44 keys. Compared to staggered 40% keyboards, which typically have only 42 keys, the Plank