Probably the former is the more common practice, but the statement cannot be made with any degree of certainty.

Among the Zulus the sequence is from thumb to thumb, as is the case among the other South African tribes just mentioned; while the Veis and numerous other African tribes pass from thumb to little finger.

The Eskimo, and nearly all the American Indian tribes, use the correspondence between 6 and the thumb; but this habit is by no means universal.

Respecting progression from right to left or left to right on the toes, there is no general law with which the author is familiar.

Many tribes never use the toes in counting, but signify the close of the first 10 by clapping the hands together, by a wave of the right hand, or by designating some object; after which the fingers are again used as before.
One other detail in finger counting is worthy of a moment's notice.