I like the KISS format of doing things...
Keep It Simple, Stupid
I use the straps with Dutch Clips as I find it makes for a very fast easy setup. I have one moving part, the cinch buckle.
my .02 cents worth.
I gave the whoopies a fair shake last week from Gorham to Grafton Notch. I've really fallen in love with rope splicing and I think the whoopies are super cool, but I'm going back to straps and buckles.
I find the straps easier to set up and adjust, but that's not a deciding factor. I knew that going in and was willing to fiddle a little more to save some weight.
Another issue which may just be unfamiliarity is sense of security. Even with inch-thick sticks for toggles on the MSH, I still didn't feel totally confident. Again, I recognize that this is likely just getting used to something new.
More important to me were keeping the straps separate and strap wear.
I came pretty close to walking away from the tree straps my second morning out. I know this can be addressed by forming good habits, but keeping things simple and one-piece is a big advantage in my mind.
My old straps look almost exactly the same today as they did before my AT thru-hike last year. The biner and buckle system just doesn't put any significant wear on them. The tree straps I used last week already look worse.
I'm not advocating anyone do one thing or the other. I don't care what you carry. Just thought I'd share my experiences in case it would help anyone else.