for me, the Rope Wrench is the easier to use tool, especially when making micro adjustments (like letting out just an inch of slack so you can reach something). all around user friendly, easy up & down, ready to go on any rope.
the effortless slack tending (or even self tending), ability to make bigger swings, and being able to fully collapse the device to pull against a flat rope angle with it fairleaded over branches with the weight of +100' rope hanging down the Rope Runner is why i like it in the bigger trees.
Rope Runner has a rep of being hard to engage, especially before it's been broken in. I always found it way easier on static rope but still requiring the right adjustment and hand position. With Scandere it was like butter. maybe i just got lucky but i'd say it's worth a try. too bad we all can't just go demo it at local shops or "rent a rope"
& no need to apologize for anything, only stupid question is the one you don't ask, we're all resources of experience for each other to learn from