I have the Quick Mill Alexia, as well as the Quick Mill stepless grinder. Like you, I also drink mostly milk-based drinks, although my wife drinks americanos. As as been noted, the Anita is an HX machine while the Alexia is not. This means that the Anita (and Andreja and Vetrano) will allow you to pull a shot of espresso, and steam at the same time.
The Alexia is not an HX machine, so you have to pull the shot then flip the steam switch and wait up to 2 minutes for it to reach steam temperature. Actually I rarely wait the full time, as it is a very powerful steamer and I can easily steam my milk after about a minute.
Aside from that, it is an excellent, well built machine, with an e61 group and you can pull excellent doubles and singles.
My decision was based on mostly cost. The Anita runs about $995, which is about what I paid for the Alexia/grinder combination. For my personal preferences, I decided to wait the extra minute or two and fit the Alexia into my budget. Now that about a month has gone by I find that I'm very happy (extremely happy) with my decision. For the two of us (I rarely if ever entertain) it works well, and I can pull a double rather quickly and wait the minute to steam my milk.
Did I say that it pulls excellent shots? I'm sure that is true with any of the Quick Mill machines, but I'm amazed that I can consistently pull back to back really good shots - much, much better than my older Starbucks Barista.
That's the biggest difference between the machines, and there are some other minor things also, but I'm sure that you will love whatever you choose.