Depends on what you want from your EDC. Is weight a concern? Blade length, shape and blade steel a concern? What will you mainly use it for?
550 is a tank, but it is a manual folder knife no high tech stuff here just plain big bronze washers on both sides of the blade. Nothing wrong with that as my Gen 2 and Gen 3 are smooth as heck and the blade deploys fast. Its a tad on the chubby side as in it is a THICK knife and its not light either so I tend not to carry it that often due to the size and weight. Blade design is basically short of a sharpened prybar, not a very good cutter but the s35vn can get quite sharp.
560 is a HUGE tank, rocks KVT ball bearings so its very smooth opening and closing. Rocks a flipper so deployment is easy via a flick of the finger also has very nice 3d machining on the lock side. Unless you like carrying something this large daily I don't suggest it, its not only heavy but thick as well. This is deff a burly mans knife, IMO its a awkward knife and is not practical for my needs as a EDC knife.
0562 is middle child of the 2 above. It also rocks the KVT bearing system via flipper design. Smooth as a silk and the blade flies out nice and fast. It's slimmer in the pocket than either above, its a lil bigger than the 0550 and a lil smaller than the 0560. This is supposed to have Rick's "SLICER" blade geometry, its better than the 2 above but still not a great cutter. Great knife but I just don't carry it daily.
ALL three knives are 5oz or more, not sure if that bothers you, if it doesn't then take your pick. I personally like to keep my EDC at ~4oz and below with a 3.25" to 3" blade. Anything bigger or heavier it tends to just sit in the safe or get sold.
I'am a ZT fan, so you can't go wrong with a ZT, they are all great knives. I currently daily a ZT 0770CF and a ZT 0808. The ZT 0450 is another good EDC option if you want slim and lightweight flipper. Others have mentioned the 0566, its not bad I'm not a huge fan of assisted knives (made an exception for the 0770) and I think ZT should have put a Titanium backside vs the stainless steel they used. I chose the the 0770CF instead of the 0566 for the great blade shape, and have not looked backed since.