My guess would be that they are “pouch” cells vs “prismatic” cells on the inside which is not ideal for a battery that will take some abuse in a boat. Basically pouch cells can be packed into a smaller form factor but lose durability. Not sure if there is a lot of boating specific data out there for each form factor. I believe prismatic is also much easier to replace if an individual cell goes bad. Personally I’d stay away from the mini if space isn’t an issue, but they come with a warranty so worth a shot if you need the form factor.
Of course confirm with the manufacturer if it’s pouch vs prismatic, I’m assuming this based on the standard.