When I use a neck strap, I'm using a Boston Sax Shop strap with the wide slider that keeps the strap from pinching around the neck. I liked the padding on the Just Joe's strap more, but I can't give up the wider spaced strap now. It's so nice not having anything pinching there.
Now Joe is selling his straps with a "wide enhance bar" for an extra $10. If I were buying another neck strap right now, that's what I'd do, but I don't think the difference is big enough for me to spend the $90 after spending $75 on the BSS one.
I've had some back issues in the last few years, so I've been exploring some alternative options. Most harnesses I've used seem to rub me weird somewhere or put the horn in an awkward position relative to my hands and face.
The jazzlab sax holder is very cool and is great for really getting the weight distributed, but I find it to be unstable when leaning over or twisting, like if I'm picking up some sheet music that fell on the floor or adjusting a music stand. It really feels like it could tip over and just fall off entirely. I've spent a fair amount of time getting it adjusted, but haven't been able to find a spot that is totally comfortable and quite as stable as I'd like. It's fine for playing at home where I'm consistently standing in one position, though.
For bari, I'm finding that the weight distribution of the sax holder makes the other drawbacks worth dealing with, but I've been back on the neck strap on tenor for the security and freedom of movement. The sax holder is also a bit of a contraption to have to bring around with you. No problem in a bari bell, though!
I just picked up a Balam premium "back strap" from another SOTW-er and it seems like it could be a good middle ground between the neck strap and the sax holder, but I've got to play with it some more.