I looked into both, but decided against them. I have heard that with MMM it is difficult to start later such as 4th grade, which we would have been. I was fortunate enough to see a workbook, which dd was not attracted to. For those who are not naturally math minded, it looked difficult. Just our opinion.
MOTL I talked myself out of because I needed to be honest with myself. I would not keep up with writing the 5 daily review problems. I really like the idea of customized review, and the small amount of problems, but I don’t enjoy math and have multiple children.
Livingmath.net sells lesson plans for math history. There are tons of math literature books. I love this idea, and was going to do that next year, but I found out that I am expecting. I was going to do math history plus another math curriculum for three students next year. I hope to do math history in the future for several years. Instead I am going to add a math literature book weekly.
Hth,
Retrofam