I can comment on the OL dac and the EL dac as I have and use both. With respect to Mr. Seaber (excellent businessman imho), while both may be cut from the same cloth, the EL dac is a better sounding dac if you are a careful listener and do a few things to maximize the performance of any usb dac you may wish to consider.
The EL dac sounds a bit more sophisticated with more apparent detail, more natural timbre and a bit more space between instruments imho. One of the big differences to me is the fact that the EL dac has an ASIO driver available and it does sound better than the wasapi event mode in Windows 10.
As for the Mimby, I am afraid I have not listened to it. I have owned the Bimby, Modi, Modi2, Modi 4490, and lived with the Gumby. These are very good dacs, but I think their USB implementation was quite weak for some time and may have improved a lot recently. Then again they sell the Eitr. After reviewing 5 usb bridges into several thousands of dollars, I do not own one of them. A very good or great dac can have a USB implementation that does not need a USB bridge.