iA Writer? Can add Scrivener too.
I hear what you're saying, and for some, you'd be right. I haven't extensively tried the iPad app for Scrivener, but I did use the desktop version for a while, and while it did what did fine, it seemed kinda kludgy and inelegant. The sync is done in the form of packets to dropbox and it's slow and I worry it'll break. It also had a bunch of features I don't use, so a lot of is bloat-y.
AI writer I've never tried in-depth, but I think it was the one that didn't have options for themes or different fonts? I have a feeling if I did go to anything, it'd be AI.