I have both an e-tool and a Deteknix Diamond digger (same shape as a Lesche). I use the e-tool for digging in places like gravel river banks and in the woods, and my Diamond digger for parks to keep my holes nice and tidy.
So, get both! I may also invest in one of the 18" T-handle sampson shovels in the near future just to have a little more leverage digging in the hard red clay dirt in my town this summer.