'Kissing' the back of my hand has called in cats, fox, coyotes, owls, hawks, etc., so as long as I have one hand, I can call stuff in.
E-calls shorten your learning curve as to how-to-call, but I like hand calls better in that I can add 'emotions' to my call. Heck, I started with an old car cassette player and a Radio Shack speaker horn, and called in a lot of coyotes.
There are 2 common answers to your question:
1, most any e-call will work for you;
2, stand selection, which I consider to be more than 50% of the equation. Pick one that puts the odds in your favor.
For example, if you set up with a brushy ravine 100yds downwind of your stand, you might not see any coyotes, as they will use the cover to wind you.