Round tokens in general are much more commonly found than tokens of any other shape, regardless of denomination. I think there may have been a slight price differential at the time they were made - most makers offered various shapes, but the price generally was dependant on size and the metal used, rather than shape. I have seen a 1908 price list from the Salt Lake Stamp Co., maker of a lot of the tokens in my area. For their standard round token, they offered 5¢ or 10¢ size at $1.50 for the first hundred. 25¢ size was $1.75, 50¢ size was $2.00, and $1 size was $2.50.
They did not offer 1¢ denominations in their standard line as the price would have been over face value. That was usually the case, so 1¢ tokens are less common than higher denominations. Sort of like the problem the U. S. Mint is running into today with cents and nickels - seniorage has gone negative. In the past when this happened, there was a size or metal change before long. And it doesn't take long after that for all the old types to leave circulation to be hoarded or melted.
On the subject of the book - Lipscomb's Second edition of the OH token catalog is something worth having, especially if you live in or around OH. Check eBay or the new/used book sites on the Internet as there is usually one available. There is one on eBay right now. Even the first edition would be better than not having one.
John in ID