If you’re comparing these two machines, my questions to you would be: what makes you think you want the m8? What makes you think you want the OT? What musical problem are you trying to solve? They have wildly different capabilities, goals, and design philosophies which will cater to wildly different approaches.
I owned a m8, sold it to fund the purchase of the m8 model:02. Truthfully, I haven’t really thought about it in the 2 weeks I’ve been without it, which tells me I may not need the new m8 even though I really enjoy using it. But without knowing what draws you in about these devices it’s impossible to answer this question.
(It also may be worth asking in the m8 thread)