For speakers, I will take better sound over appearance any day of the week

It is hard to say
how much better they are, but unless the cost was significantly different, you are still better off with the Infinitys. Are they twice as good? Probably not, but are they worth it? That's kind of for you to decide. If you are happy with the sound, that's the important thing. I'd say it is worth auditioning the Infinitys to get an idea yourself.
I haven't heard the EMPs, so can't comment on them.
The TSIs are basically the same speaker as the Monitors.