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Bms per cell or bms per pack

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Forum searches are always painful, just as it was this time.
Unfortunately it didn't find any results.

So the question is, should I be running 1 bms per cell or run a single large bms.

What I have/doing:

12v/8000mah packs (was advertised as 20000mah, I'm pissed but that's a discussion for later)
Pulled each pack down to find
[email protected] pouch cells. A with individual bms modules on each cell.

The plan is to use these to create
1x [email protected] pack. (was intended to be 20ah)

Does it matter if each cell has its own bms, while running on a sevcon powerpak @300a? Or should I run a larger single bms?