Both will work fine but a flat back is usually easier to find in my area so that's all I have. You're right about one piece bases I've been limited to EGW and DNZ gamereaper mounts and most have required bedding in the rear to correct "torque" of the rail.
Function wise they're identical until you get into the new ones with bottom bolt release. If you can stomach not using a NF base on a flat back then I would use whatever you can get your hands on for the best deal.
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