It's kind of easier to get skill cape, It really depends what skill it is, and for the easier ones, it costs money. But to get a quest cape you have to have a lot of skills up not just one. Like for example, cooking would be easier than quest cape, but it costs 5m, so actually ya, I suppose if you don't want to spend money, it is actually harder to get a skill cape. But for a quest cape you have to work to keep it, with 1 or 2 quests coming out every month.