Lots of people have their own opinions on what is better, and in some cases different distributions may be better for an application. It depends on the needs of the end-user. And to have options and competition is a good thing.
Ask google. plenty of blog posts and articles on that very question
Core to it is understanding what linux is. No distro is 'linux'. They all just happen to ship with the GNU/Linux kernel. There's a common set of tools to all of them, and a lot of the differences are just cosmetic
The big ones can be divided by their controlling ethos. Redhat/suse have commercial ownership and are driven by the need to provide stability and support to paying customers.
Debian prides it self on being entirely free (in every sense) and Ubuntu is heading down a road that makes it easy to use for the desktop (although it still fails at that)
I've set up VPN network between office and shop. Everything seems to be ok except for the fact that I can ping simple devices only. For example, we have scales with TCP/IP interface. So, from the office I can ping scales, that are on the shop network. But I cannot ping Linux Pcs there. And vice v...
well, I still feel like there are more ssh-related utilities to understand. I always had my own for of an ssh-copy-id... nice to see something bundled with, though.
@Iain I was of a mind to think that it ought to be closed as TL. The problem was described inaccurately/incompletely, such that the answer is almost irrelevant to the question as it is currently written.
@Iain of course, if that's not the logical conclusion that others reach, then I'm content to be 1 vote of 1
