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^I don't really think it's that simple, they're just different. The ToV's are long and tedious (wow, 100 of the same two enemies for half an hour!) whereas MM is quicker (mostly) with varied enemies throughout it's missions, is much more punishing and has more relentless AI.
But yeah, Robin_Mask, if you're just interested in the achievements may be better not to bother but I think it's hella good fun, just hard. The achievements are for completing all missions on each difficulty (4 seperate ones) and for getting all bronze, silver and gold medals in the survivals (3 separate ones). The other couple are just complete X missions and get an iron medal in survival (lowest).
"In a world without rules, danmaku is nonsense." ~ Marisa Kirisame