I've used Stan's, which would be great IF it weren't for the rubberized, semi-solid, cottage-cheesie residue and clogged valves it tends to give rise to ... I've tried, and like Muc-Off, good stuff with hip marketing and some great ideas, such as providing an application tube that fits/works perfectly with the bottle it comes in -- not rocket science, but super convenient and efficient. The downfall of Muc-Off for me came when it failed to seal a moderate puncture on a recent ride. I was forced to resort to the installation of a tube to limp home and when I got there, found Orange Seal was up to the task of sealing it. Hence, the five stars and favorite status.
I've used a lot of different kinds of sealant over the years and have landed on Orange Seal (original, not performance) as my go-to. It dries out a little faster than some of the other options so you'll need to top off a bit more frequently, but from road riding to gravel to MTB this stuff works quickly & reliably to keep you rolling.
I love the 32oz bottle. It's less waste and more cost effective.
Works great for tubeless wheel setups, but the real nice thing is that there are no chunks that I was able to use it in punctured sports balls using a needle. Some other brands clog up the needle, but the Orange Seal works like a charm.