The first product - witty - simply monitors the current and once it falls to a set figure it assumes the phone (or whatever) is at 100%, so disconnects. Better than nothing for dumb charging circuits, but the battery is still being driven to 100% (or higher).
The second product - chargie - works differently. There is an app which monitors the battery state and which talks to the chargie dongle. There is no direct current measurement, so any patent along those lines wouldn't be troubling (I haven't look at any patents for these so don't know what they actually are). To me, chargie is much better since it can cut off the charger at, say, 90%. I have a battery app which notifies me when the battery is charged to some user-defined figure and then I unplug it. But, obviously, I'm not going to if I'm asleep or absent.
The witty product I would yawn and say "whatever", but I would actually buy the chargie since it would achieve automatically what I try to do manually.
Regarding patents in general, they are really only worthwhile to be able to say the product is patented. Many patents don't actually cover the significant feature of a device but some side thing, but even if it was perfectly written and filed, it only allows you to spend lots of money suing someone with the hope that a) they will stop ripping you off, and b) pay you some wonga in compensation. No-one will turn up at their shop and confiscate their goods, lock them up or fine them for you. You have to fund that yourself. For a big company that's perfectly doable (and sometimes worth doing even when they don't have a leg to stand on, just to put the fear of God into whatever minnow they want to destroy), but for a one-man band it is pretty onerous, expensive and without a guarantee of success.