You should get good service support and reliability from all of them, provided your local distribution agent is a good one. In the UK for instance I would trust all 3 on that front but I would expect very different support pricing structures.
Any machine these days can do a quick changeover, bunch of feeders in trolleys, swap over the trolleys, load a new product, done. This relies on a kitting team to have loaded the next lot of feeders and trolleys, and doesn't account for their time. If that is a problem, then that is the Mycronic party trick, their Agilis modules can be loaded with tape much more quickly than most feeders, and its cheaper to own lots of them (especially if you want to choose intelligent electronic feeders).
Really the choice comes down to which machines party tricks you like the most.
Juki has some clever options for placement offsets and using on the fly laser alignment for smaller parts, which helps it be quite fast. It's also a pretty flexible "flex placer".
Hanwah has fewer party tricks, its a more basic machine, it will be cheaper, its slower but solid and well liked. Its auto teach of new component shapes seems to be quite good and if you are running one machine, you have to love the end loading tray feeder that lets you add a tray changer without losing feeder slots.
Mycronic is all about Agilis really, if you are sold on Agilis feeders, this is the machine for you, only Europlacer has a similar solution, both of these also hold more feeders than your other options. You might also like its integrated vacuum generator so you don't need an air supply, the fact all feeders etc are on the front and perhaps the manual load adaptor for running prototypes, small batches or odd shapes.
I suggest you get on the road/train/plane and look at all 3, get a feel for the software and the feeders, and make sure you understand each of them
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