Why a Pictory alternative depends on whether you own a camera
Pictory answers a specific constraint: there is a deadline, there are words, and there is nobody available to film. Stock plus captions plus a voice gets you a video, and for a lot of content marketing that is genuinely enough.
Montaj answers the opposite constraint. There is footage , you, talking, in a room , and the reason it has not been posted is that captioning it and trimming it is a chore nobody enjoys.