I use an igloo. For years, I've used the plastic valve on the outside (3/4" inside and about 1" outside diameter). To put this in I had to ream out the opening a bit with a rasp. Before I had this, I used the 2 plastic bucket system, with a lot of holes drilled in the bottom of one bucket. When I got the igloo, I just cut out the bottom of drilled bucket and put it on top of some plastic in the bottom of the igloo and let the wort run through that out the spigot. This has worked well for lots of years - 8 or so?
Now I'm tired of that and the plastic with the holes in it is wearing out and breaking around where the spigot is, so I'm going to the wire SS braid. Also, I've had a few stuck sparges - especially with wheat beers. I just learned about the braid yesterday on this forum! What I ended up doing is just putting a 3/4" threaded hose fitting adapted to a 3/8" barbed fitting. This then goes to a 3-way fitting and a braid loop. I'll give that a shot when I brew this weekend.
I'm brewing an American Pale Ale. Last Sunday I brewed an oatmeal stout. I hope at least one of these to be ready by Thanksgiving.