... As a market leader, TomTom just became an easy choice, my other thought was Garmin but I preferred the meni system of the TomTom when looking at them in Halfords.
The reason I settled on this was mainly the larger screen - I wanted one with IQ routes and this just ended up being my favourite. ... Read review
They're the same thing - the XXL IQ is short for IQ Routes, basically some people drop "routes" for length; the R in IQR is also short for Routes. The XXL simply refers to the screen size - 5" as opposed to the 4.3" screen on the XL models.
Link to show you the XXL on TomTom's website. ?>