Natural Selection vs. Targeting?

Recent conversations with -boatman- we discussed the issue of finding caches to complete the 81 category grid for the Well Rounded Cacher. -boatman- is lacking finds in the 5 and 4.5 difficulty range. He prefers the high terrain rated caches, hence his 1.74 terrain average that exceeds my 1.69 rating. I expressed to complete the grid it would require to solve the puzzle/unknown caches at home. As for most everything below the 4 terrain/difficulty rating, I used natural selection. Just going on a cache run and signing logs and not concerned about the rating. The last several I have had to complete where were in the 4.5 and 5 range, I had to be selective of what I want after, solving puzzles long before I left on the run.

Another cache, Abiectio, the Evil One? (Challenge Cache) requires the cacher to create a bookmark showing they visited a regular size traditional cache in every West Tennessee County. Find an earthcache and virtual within the grand division. Also, a puzzle and multi that at least a 3 difficulty or terrain. For many of the seasoned caches and especially those from the Jackson area, this one should not be difficult. But for the less seasoned cachers from the corners of West Tennessee, such as Lake, Henry, Shelby and Hardin counties, this one will be a difficult challenge.

My purpose of the cache requirements, that unlike the Tennessee County and DeLomre Challenges, where any physical cache will do. For the Abiectio challenge, I want the cacher to experience everything West Tennessee has to offer. Such as the small towns, cities, trails, parks and geological features. For the seasoned cacher, natural selection of the years of caching will accomplish the goal. For a newer cachers, it may require being selective.