Parmak tends to be the best. I have this one:
https://www.amazon.com/Parmak-HS-10...s=parmak+fence+charger&qid=1587320268&sr=8-10
My coop/run is 16 x 40, and the fence is about 3 feet out. I run 3 strands of wire. The first most critical thing about setting one up, is grounding. Don't hesitate to put in deep rods, solid copper, and at the very least, 2 of them. They have to be deep enough that there is moisture in the ground. BTW, if you go through a real dry spell, water the area(s) where the ground rods are at. You can use the tape type wire, or regular wire (that's what I use), but get a game cam, or surveillance type camera, and use it for a couple weeks to get your wires adjusted to the type predators you are dealing with. It took me a couple days to fine tune my wires. While this produces a good electrical zap, some training may be involved.
Mine works for dogs too, but my main objective was to keep out the several opossums, and raccoons. At first, the majority of the raccoons that initially got shocked, didn't return for several nights. There was one, that it took several nights of getting shocked, before it got the idea, and hasn't returned. The ones that initially got shocked, and didn't return for several nights, did come back, and had to get shocked again. This repeated itself a few times, before they got the idea, but after about the third or fourth time, they have not returned. The opossums got idea quickly, however, there is this one opossum, that checks the fence nightly. If I slip up, and forget to turn it back on, after tending the chickens, that dang opossum won't. I make sure the fence is on after I leave the coop. It's habit.