Humans use a decimal system because humans have five fingers on each hand. Computers prefer a binary system. A hexadecimal system is usually used as a compromise. But what about an octal system? Simply not using your thums when counting.
0 0 00000 0
1 1 00001 1
2 2 00010 2
3 3 00011 3
4 4 00100 4
5 5 00101 5
6 6 00110 6
7 7 00111 7
10 8 01000 8
11 9 01001 9
12 A 01010 10
13 B 01011 11
14 C 01110 12
15 D 01111 13
16 E 10000 14
17 F 10001 15
20 10 10010 16
The most important advantage is that humans don’t have to shift to new numerals for decimal 11, 12 etc. if they want to leave decimal thinking.