I prefer wanikani myself and have completely switched to it for all radicals, kanji and kanji based vocab.
The reviews do pile up, but that’s because people just rush ahead and don’t pace themselves. You don’t have to do the lessons as soon as they are available to you. If you wait until you are ready for adding more reviews to do the lessons, you will find you don’t get overwhelmed as much. Of course you don’t level up as fast as if you rushed through it, but it helps me actually retain the knowledge.