I use the peak design strap and capture clip. Its "almost" perfect for my needs. There are times when I don't want to use a strap and its the only strap system that you can take off the camera really fast and not have those bulky clips on the strap holes. The only thing that I don't like about it is that the strap is not wide/padded. If you have a big dslr and big lens (for example 5d mk3 with a 70-200) then the strap tends to dig on your shoulder and its really uncomfortable. Its currently winter time so its not so bad when I'm wearing a thick jacket. I suggest waiting for the padded version at least.
I prefer to use it on my EOS M and the strap is so small that it takes up very little space when I have my EOS M in my small bag or jacket pocket.
I also have the peak design "cuff" for those times when I don't want to use a strap but still want to keep my camera secure. Having the connectors on my camera already makes it alot easier for me to put it on instead of having to screw on a separate hand strap. One situation I run into constantly where the cuff was better to secure my camera than a neck strap is when I would shoot in a pool with the water up to my chest. If the camera slipped off my fingers somehow, having a neck strap on would mean the camera will still end up in the water but with the cuff all I need to do is raise my wrist above my head if I drop my camera. Thankfully that has not happened....yet.
As for the capture clip, its good for what it does, but I prefer it on my bag strap than my belt. I have a big camera and big lenses...it tends to pull my pants down alot lol. Also, having the capture plates on my camera bodies already makes using my Arca Swiss compatible tripod heads a bit faster to use. No need to screw on a separate plate.
Its a bit pricy for my taste but I got 2 sets of all 3 when the leash/cuff was introduced on kickstarter and got them all for nearly half price
For weddings, I dual wield 2 bodies, 2 speedlites, 2 lenses (24-70 2.8 and 70-200 2.
and thats when I use the Black Rapid double strap. The wide padded straps makes a huge difference compared to the peak design strap.
As for the other straps, I've never used them so I can't really compare or comment about them.