With the same reed and mouthpiece, if one ligature results in more resistance playing than another, then IMNSHO it is a non-functional ligature. It is not doing its job. Probably the reed is leaking, which is a common source of playing resistance.
Personally, I find the Enlightened ligature to be well made, and esthetically pleasing, but totally unsuited for its intended use - namely to hold the reed firmly on my mouthpiece table. But that's just me. I know lots of people use them, but lots more use Rovners, another ligature I find unsuitable. There's no accounting for taste.
OK, curmudgeon snark over...