I have the Unichorus and Boss CEB-3. My .02 cents....
The Unichorus has a mix control however unfortunately it is a trimpot inside. I really would like it to be able to adjust the mix via an accessible pot. It does have a mode switch that changes the delay time, but I would prefer a bit longer times than the preset times of 3 ms, 5.5, 10 ms. It's nice but not my goto chorus.
I like the Ceb-3 features of efx level and the ability to adjust the chorus crossover frequency. Cutting the lows on the chorus keeps the bottom end focused. Nice, but for me the preset delay time turns the chorus a bit to metalic not smooth. With the crossover though I can dial in a nice blend. I have not tried the Digitech but am intrigued. The demos sound nice and have a variety of settings available. I guess it depends on your use of a chorus also. I like to have subtle chorus to open up the sound and give it a little movement but not so much so as to be overbearing. But also like to be able to dial in a thick, lush chorus from time to time. My current choruses that I like are the DLS chorus-vibe, Dr Scientist Cosmichorus, Clone theory, or the Trex reptile delay that has modulation. If you are interested I have a number of chorus clips here:
http://www.soundclick.com/bands/defa...bandID=1014001
One that I am interested in is the Visual Sound liquid chorus that has a variable delay time. And also the Digitech after hearing the demos and the Earthquaker devices... and plenty more.....
There are so many out there, good luck in your quest.
......Lapicide