the dream is the latest platform, so I wondered why you consider the clear vs. binax (which is the very latest from siemens).
What the dream has and the clear not is a higher possible input level. With live music, you often have peaks above 100 dB, and the widex dream can process them undistorted (even if they make the sounds softer afterwards).
Both dream and clear come in different powers, so it doesn´t have something to do with the hearing loss which one you choose, rather with the kind of input the ha´s should handle.
However, I didn´t like the sound of the widex at all. It sounded very much like a small transistor radio or a speaker in a tin can or something. I tested them with loud music, and yes: They really don´t distort. I don´t want to confuse you: I´m looking for my first hearing aid, and my audi said: Widex isn´t for beginners! So if you are an experienced user, they might be really good for you, they weren´t for me.
I liked the siemens much better, they sound very natural, when I wore them I often forgot that I wore an aid at all. Siemens are great for speech in noise. In fact, the only thing that didn´t work with siemens was live music (including my own piano-playing and singing), so I won´t buy them (testing bernafon right now), but apart from that I really liked the siemens.
Widex sounded unnatural in all situations. I´ve even had an REM done with the widex, because I couldn´t believe that a brand that advertises excellent sound sounded so bad, and really: compared with an NAL-NL2 target, widex over-amplified the target quite heavily from 1 to 2 kHz. It´s hard to compare widex to any official target, as they use a proprietary fitting formula, but it showed objectively that the widex perform very very different to other hearing aids (my audi was astonished).
The useability is, in my opinion, far superior on the siemens, too. Siemens has (for the bte reciever in channel, medium size) a rocker switch. You can configure, for instance: left aid: volume up and down, right aid: program up and down. You can´t do that with the widex, they only have a button. If you want program change + volume control, you cannot use the widex witout a remote control.
I haven´t tested telophone (i use the phone without aid), and I haven´t tested streaming.
It all boils up to being a very subjective choice, take you time to test those devices carefully! In my opinion, they are very different.