Does the legality/idiomaticness of verb+のの+方 depend on the verb?

Question

Today when discussing language learning, I was corrected by a heritage Japanese speaker friend who changed what I said

多分書くのの方が難しいと思う

to

多分書くのの方が難しいと思う

However, the discussion emerging from this post seems to suggest 書くのの方 is correct while 書くの方 is not. So I seem to have been in the right. But what about verb+のの+方?

This site, maintained by college level Japanese language teacher Kano Yoko, claims:

Q:日本語を話すのと書くのと、どちらの方が好きですか。Which one do you like, speaking or Writing Japanese?
A:どちらも好きですが、書くことの（or 書くのの）方がかんたんです。　I like both but writing is easier.

(Note:のの in the 書くのの is often omitted especially in conversation.　Consider that it becomes a relative clause.)

In contrast, this answer suggests 書くののほうが上手だ sounds odd. So do the legality and idiomaticness of this construction depend on the verb? Do other verbs work better?

Side note: I did find some attestations of this: 書くのの方が問題。

Answer 1

書く方が難しい or 書くことの方が難しい is the way to go.

書くの方が難しい is 100% ungrammatical. As I said in the linked question, 書くのの方が難しい is not 100% incorrect but it sounds fairly awkward at least to my ears. I suppose that heritage Japanese speaker felt the same way I did, but made a simple mistake while correcting it.