I got a Murena Teracube 2e in one of the small time windows when they were available, here is my 2 cents based on my experience:
Pros: /e/ is already installed, bootloader is already unlocked, it was relatively easy to root with Majisk out of the box (if you want to do that). Overall, very little work. Another thing is that even though they try to minimize it, the stock OS that comes on the 2e from Teracube has some bloatware that they’re still trying to remove systematically.
Cons: The first phone that /e/ sent me wouldn’t charge, and the replacement took nearly a month. I had to go through /e/ for the replacement, and I’m sure that added some days to the process. Another thing is that the Murena phones come with a recovery program made by /e/, which is very basic and doesn’t have a backup feature like TWRP, which is the recovery program you would use to install it yourself.
Either way, I think you’ll be OK – I really like using the phone.