Pre-nobling and renobling is much stronger on packet worlds and defenders don't need any additional advantage. Someone nobling themself 3 times then losing the vill shouldn't cost as much as it does on packet worlds in my opinion.
However, not being able to immediately get a train means you have to work together with people early on more.
But then equally on coin worlds people can swap villages if this would work better so maybe thats a good thing.
But if you lose a bunch of vills on a coin world you get more nobles available, that has always seemed silly to me as well.
Overall the first factor has always seemed the worst to me since some world ages ago on .net (somewhere between 33 and 45 but unsure which) where someone sent 9 nobles (a 4 train and a 5 train) at the account I was sitting for someone, at the time they had like 8/9 vills (had been saving nobles for a while for the attack) and I prenobled and timed attacks after each of their attacks (i.e. a nuke to kill their nuke with noble then a run of a few lc to kill the escorts so they nobled the account I was sitting twice, themselves 7 times and then lost both vills back.
The fact that that is possible has since seemed really rather stupid to me.
Also my first world was coins so therefore coins must be better.