18-55mm vs. 18-105mm

I am wondering if the latter can completely replace 18-55mm or not. Provided most of the time (Like 70%) I am using 55mm focal and below. Or should I just buy 50-105mm or something else more 'worthier' than 18-105mm?

Meanwhile, I heard that 18-55mm has a better focus for near 18mm focal than 18-105mm. Is it true?