I was lucky enough to pick up one each overseas this year.
I have a 96sq" Trifecta with a featherlight shaft and a 91sq" V Drive with featherlight shaft.
I chose the featherlight shaft as I cut my paddles very short compared to most other people.
Your shaft options will be either round tapered or oval tapered. The oval tapered being the stiffest.
The V Drive is my preferred option for sprinting or DW as it's got an instant big strong catch. Pulls smooth and has a nice clean exit. It's best point is it's big catch; great for sprinting that little bit extra for a bump.
The 91sq" V Drive works very well with a higher cadence paddler.
The Trifecta has a softer catch but really loads up progressively through the stroke and feels buttery smooth and powerful. Lovely clean exit too.
I love this for longer distance flatter water type races. Over a longer distance, with a slower cadence I'm a bit quicker with the Trifecta. That said, you can sprint with the 96sq" Trifecta quite effectively when required.
I really love both since I got them. The finish and construction quality is fantastic.
Try and find a shop that has a demo of both and see which works best for you.!!!