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I have both and use both earphones and love each. You won't get a better or worse earphone if you choose either on, but both seem to have strong suits.

For instance, the t1 is a better musician monitor. It is flexible, isolates more, and has a more durable cable.

The em3 pro is excellent, and with inset cabling, is strong, but it is acrylic. Good fit will mean that isolation is almost as good as the ACS, but only silicon allows singers to have full isolative peformance.

The em3 pro is perhaps a more complete audiophile crossover, while the acs is perhaps a better musician and audiophile monitor. I think each repesent the top of their category, but are suited for different applications.