OGS offers reviews of the games, but they do not allow you to create records of where you made mistakes so that you can quiz yourself and review the mistakes and then make the right move.
The paid level of both is about $5.00 USD per month. But you dont just get told where your moves were poor: you are provided a means to turn those poor moves into flashcards that get reviewed on a regular basis.
OGS support is not solely for the AI review gain; that’s just a perk that was added later on. AI sensei is made and run with the purpose of marketing AI services. It’s not the best comparison.