Yes, Normally PPP and fountain pens make hairlines too thick and you have a quite limited choice of inks, while with dip pens you got a ton of inks (including gouache) and also quite a bit of different nibs and sizes.

You should not, however, buy a set, they are normally overpriced.

That Speedball set is decent, but bear in mind that some of the nibs are not for normal calligraphy, so if you go that way you should get this one. Still What I think it's best, is to buy your own nibs and holders separately.

Brause nibs are normally what is recommended for new people into dip pens, but Speedballs are not bad. Also a lot of people love Mitchell nibs, but they are considerably harder to use (also incredibly cheap).