I would go for the Inspiro since it's high-tech (I'm a tech geek) and it has the mute button on it
2, it has better sound quality AND it makes decsions for you based on noise!
WARNING: this is gonna sound boring but I'm about to give you the tech talk!
it has 3 screensavers on it
an alarm clock is included
it also has the date and time on it
it features Sound Check (which lets you check the FM's status)
also has the MultiTalker Network which allow 2 or more teacher to get their speeches to reciver wearing kids
has datalogging
also motoring and let you know about diffculties like no reciver is responing (happened to me b4) and stuff
AND has AutoConnect and the Dynanmic Speech Extractaor!
here's what it looks like
http://hearingisbelieving.co.uk/hearing-aid-images/manufacturers/InspiroTransmitter.jpg
there's other FM systems made by Phonak which are Mylink, zoomlink, and easylink