I like a straight shaft hand digger. I don't like the offset design, in the two mentioned. . When you push down on the Lesche or Garrett, the offset design of the tool tends to make it move lateral, forcing you to compensate. When you push down on a straight digger, the force isn't thrown off balance and goes straight to the ground.
I've been using that True Temper digger. It's thick stainless steel. Has a big hefty handle. Inch graduations. A serrated edge like none I've seen on a digger. Only $11. Only negative is, it's made in China.
Don't bother buying diggers made of aluminum (although light weight), they will snap.
I'm a bit picky when it comes to tools, so don't mind me, I'm not putting down the top brand boys, just stating what I noticed about them when using.