Take a look at this comparison of 11 different MM cartridges (including the MP-200 and the MP-150).
http://soundadvicevinyl.com/2017/12/04/under-1000-moving-magnet-cartridge-shootout-11-cartridge-revi...
Their conclusion is that the MP-200 is worth the additional cost (although it's more expensive now than when the review was conducted). About the MP-150, they say, "There is nothing wrong with this cartridge , but its pricing and market position make it hard to recommend. As the tagline says, it is similar to the MP-200 but you get less of everything, and it lacks the MP-200’s sweetness and magic."
Sounds like the MP-200 would be a good purchase if you like the MP-150.
Cheers, Scott
http://soundadvicevinyl.com/2017/12/04/under-1000-moving-magnet-cartridge-shootout-11-cartridge-revi...
Their conclusion is that the MP-200 is worth the additional cost (although it's more expensive now than when the review was conducted). About the MP-150, they say, "There is nothing wrong with this cartridge , but its pricing and market position make it hard to recommend. As the tagline says, it is similar to the MP-200 but you get less of everything, and it lacks the MP-200’s sweetness and magic."
Sounds like the MP-200 would be a good purchase if you like the MP-150.
Cheers, Scott