modular floating jetties- help required

Hi
I want to purchase a few sq mtrs of Modular floating jetties made of HDPE - I want to take a decision vis-a-vis standard walled floats and interlocking walled floats. For Example the floats promoted by jet dock are standard walled floats- The floats promoted by magic float are interlocking walled floats.
Magic float claims that their product is the best since it has got interlocking walled floats- Standard walled floats manufacturers claim that the very principle of floating has been compromised in the magic float design- As an example they say that catamarn boats are the fastest because of lower resistance to water- and hence the stability in interlocking floats are affected

Please help me take a decision- which float would be more stable - Magic float is cheaper

Regards
Sbh