Having used both, yes.
KameSame forces you to recall not just the reading, but also the appearance of the kanji, since you’re using a Japanese keyboard on your device rather than the application translating romaji into hiragana. With KW, I ran into issues when handwriting where I couldn’t easily remember which kanji to use (note I have restarted my Japanese learning since then in an attempt to learn the language better)
KaniWani is useful for recalling the exact reading, since if you enter the wrong reading of the kanji it won’t accept it, but if you’re writing a word getting the reading correct doesn’t matter if you accidentally use the wrong kanji. So personally, I would recommend KameSame over KW, just make sure you are recalling the correct reading