Hmm... I don't find Scribe Scroll to be a feasible "replacement" for the flexibility granted by spontaneous casting. Especially scrolls of mid-high level spells are fairly expensive and you simply cannot carry around enough of them to get to the same level of flexibility the FS has. And using up multiple scrolls every day can quickly render you broke.

I'm mostly not talking about these spells, which are only rarely needed (scrolls are great for those), but more importantly those spells, which when you need them, you often need them multiple times for the party (i.e.
Death Ward,
Freedom of Movement). Preparing those often enough is not feasible for the Cleric usually (or IOW puts too high limits on their remaining selection), but the FS always has them available in large enough quantities.
But as I said initially, playing style is certainly also a factor in there, and one that is not so easy to consider.
About the highest level
Cure spells... that's what the FS uses the switch spell option every two levels for, at least until
Heal, then you don't need any
Cure spells anymore.
About the Cleric vs Wizard spell list and Favored Soul vs Sorcerer spontaneous casting... IMHO, even knowing all the spells gives Cleric a weaker "spell knowledge" than what Wizards have, who typically only know a fraction of their spell list. That means, that there are very few "must-have" (lacking a better description) spells found in every spell level, and these few can easily be covered by a FS, plus some additional for added diversity. I really find it a lot easier to write up FS Spells Known than Sorcerer Spells Known.
Bye
Thanee