Hi Stuza. No experience of those but I have used
one of these for a year or more now and it is excellent. It will re-charge an average device 1 1/2 times, so should be enough for a long weekend. It is also incredibly slim and light.
I think WaveyDavey has used one of the solar ones and was quite impressed, although I've heard less enthusiastic reviews from others. Probably depends on the weather!
For battery power you should be able to figure it out. For example, if the battery in your device is 1000mAh and you get a charger that takes 4XAA batteries at 2200mAh then you should get, roughly, 8 full charges from it. Obviously, it will never quite work out like that but it should be a rough enough calculation to give you an idea.