Both procedures are good, and no one can tell you what to do in your particular situation without actually examining you themselves.
You understand the core issue of the debate: the Benelli lift has less scar, but it may not lift/tighten as much and the scar can be thicker or pucker. Without seeing you, it is impossible to know whether it would work for you.
I'd say this: 5.5 in general sounds like a lot to expect out of a Benelli. And, in general, if your SN:N is 26 as you say, 5.5 is probably more than you need to be lifted. The most common error with a breast lift, no matter the technique, is to raise the nipple too high. So I'd look into that again.
Be sure that your Benelli surgeon really understands what he/she is talking about and be convinced that they are highly experienced with that procedure before you select them.
And one more thing: most American surgeons call any breast lift with a scar just around the areola a Benelli. But Louis Benelli described much more than that: wide undermining with extensive reshaping of the breast. If your surgeon is calling it a Benelli, be sure he/she knows enough to know what a Benelli really is!