I own the Walsh 2000s, but have not heard that particular Mirage model. Major differences to consider are the use of metal tweeters in the Mirage, and the frequency of the crossover, which is way up at 8kHz for the Ohms. Although both aim at a quasi-omnidirectional dispersion pattern, they are radically different designs. One thing about the Ohms, is that IME, every model sounds the same, with the only difference being max SPLs and deep bass extension.
If you can find a seller of the Mirages that will allow an in-home trial, like Ohm does, you could compare them yourself, in your room with your gear. IMO, that's the best way to choose a speaker.
If you can find a seller of the Mirages that will allow an in-home trial, like Ohm does, you could compare them yourself, in your room with your gear. IMO, that's the best way to choose a speaker.