Do you think I should use kanji with similar sounds or stroke patterns?

Since people usually ask, this is my own app. It actually got its start right here in this sub: https://www.reddit.com/r/LearnJapanese/comments/1jyehuz/free_kanji_app/

I wanted to ask for your thoughts on my kanji test approach.

A lot of textbooks and apps test kanji by making you pick between similar-looking ones. For example, choosing between 大, 太, and 木 to complete _丈夫 (大丈夫).

My theory is that this kind of test might actually make you more aware of those similarities, which could make it easier to second-guess yourself later. So in my app, I prefer to offer very different options instead. It’s easier, sure, but it helps me focus on the right kanji without the lookalikes popping into my head when I think of 大丈夫.

That said, the app isn’t just my personal study tool anymore. I really want it to be useful for everyone, so I’d love to hear your thoughts:

Have you ever practiced kanji by choosing between similar ones? Do you think that approach works better than picking between very different ones? Should I rethink the logic in my app?

Thanks in advance for any feedback!