I know you're joking, but I hope not, actually. Although it's fun to divide by different numbers like 2, 3, 4, 6, 12, etc., on the whole, I prefer the decimal system, because it is much easier (and hence faster) to calculate things mentally, using uniform powers of 10.
As a simple example, when I need to mentally convert between millions and billions (used in the West) and lakhs and crores (used in India), it is so easy, because I convert everything to powers of 10 (e.g. million = 10^6, lakh = 10^5) and then multiply or divide as necessary, which really just amounts (pun not intended) to addition or subtraction of powers, using simple algebra.
I also prefer the Western numbering system (groups of 3 powers of 10) over the Indian system linked above, due to its uniformity (for the same reason as metric over Imperial).
As a simple example, when I need to mentally convert between millions and billions (used in the West) and lakhs and crores (used in India), it is so easy, because I convert everything to powers of 10 (e.g. million = 10^6, lakh = 10^5) and then multiply or divide as necessary, which really just amounts (pun not intended) to addition or subtraction of powers, using simple algebra.
40 million / 2 lakh = 4 * 10 * 10^6 / 2 lakh = 4 * 10^7 / 2 lakh = (4 * 10^7) / (2 * 10^5) = 2 * 10^7 / 10^5 = 2 * 10^2 = 200.
https://en.wikipedia.org/wiki/Lakh
https://en.wikipedia.org/wiki/Crore
https://en.wikipedia.org/wiki/Indian_numbering_system
I also prefer the Western numbering system (groups of 3 powers of 10) over the Indian system linked above, due to its uniformity (for the same reason as metric over Imperial).