This question isnt going to work for you I am afraid.
a) You are going to get replies form people that only know their machine and no others. So all the replies will be biased from experts of 1, instead of getting replies form people that do have a broad experience across the market.
b) You will be fielding replies form some people that actually dont know anything practical at all and may not even have a machine or the machine they are voting for, but are well read from all this fantastic info on the world wide web.....where you then have a 50% each way bet that the info you are reading is written by someone that really does know stuff, or is just some other well read joe jumping on the latest fad bandwagon that hes been reading about.....
c) Add to that, that the world is made up of a lot of individuals, all with different likes and dislikes.
d) And then after that, you are lumping domestic, semi-commercial and commercial machines into the one question without setting even one of the most basic parameters such as.....in what price brackets / budget, etc.
For a student on a budget, a $99.00 Sunbean Ristretto could constitute the best machine in the world for his current situation.
When he graduates and walks into a well paid job, some other machine will slot into the category of best for his current situation.
When he becomes the president of the company and is earning 6 BIG figures and he does a lot of entertaining, some other model will slot in....
As you can see, this question cant be done.