XXL540 VS XL250

Could some one please tell me which of these devices is superior in speed response and overall features thanks. I currently have a One XL that has ALG , IQ Routes , Navcore 9.051 and Vocalizer voice for TTS which works perfectly. I Do even have a Official TTS Voice with a special version of 9.051 that works with or without street names. It takes about 2 minutes to boot up then if you have street names on it lags badly on the map.

There is no GO 250 in the tomtom range.

Any device with 64mb RAM performs great , The 32mb devices tend to struggle sometimes expecially if testing v9 navcore on them

I have a GO 720 and this is a great overall device, good value for money, it has 64mb ram, 2gb internal storage , memory card slot, bluetooth, FM transmitter and 4.3" screen and can run all extra features ect, this is the minimum i would personally accept for a device if i had to buy another.

thanks
djc