I assume the “level 1” is in regards to the article I posted.
Firstly, everything a UX/UI designer says is only an educated guess before proper testing is done. Since I lack the resources to test the questions this will be a (debatable) educated guess.
At the current stage of (mobile) OS development, if it would be the first smartphone / tablet I would say iOS. Especially if that person lives near an Apple Store. The customer service Apple provides in their genius bar is something a level 1 would prefer to have as an option. But even without that, having all the apps on their homescreen, instead of in an app drawer, would be the preferred method. If these persons ever owned a computer, just see their desktops. Most of them will likely be cluttered since the folder structure might even be to much to properly comprehend. If they already have a device of which they are capabel of using. Stick to that OS.
Do note, I’m thinking about stock android. Skins can go a long way, which is the power of Android.
Regarding the second question, again I think the user would want to stick to what it knows. Numerous studies of different subjects show that the more everything changes, the more people tend to stick to what they know, even if it doesn’t apply anymore. If a user has never used a computer and/or touchscreen in their live and thus, doesn’t have a preference. I would think that hardware would be the better option. Not only will it provide physical feedback (clicking and typing). Hardware tends to freeze and crash less often. The concept of the mouse might be tricky though. Demonstrated briliantly in this old Dutch commercial https://youtu.be/v9dm3pRUkdw?t=19s (the women says “Go with the mouse to the upper right corner”).
Ultimately, the best answer to both those questions is : Stick to what you know. And if you don’t know any of the options. Go with the one with best future proofing.