Sorry it took so long for me to reply, didn't check the tread until this evening
Driving in a car w/ the RV mode enabled, the Garmin took me to two different low clearance bridges and road dead ends that If I'd have been in an RV, I'd have been in trouble.
The Garmin has 3 extra pieces of software to plan routes, etc which might not bother someone else - but it bothered me.
I have a large, flat dashboard so I was able to compare both units at the same time while driving. The Lane Assist on the TomTom far surpasses that of Garmin.
In side by side comparisons, the TomTom took more direct routes, where the Garmin (programmed the exact same way as the TomTom) took me to less than desirable routes (out of the way, etc)
The TomTom gets frequent GPS positioning updates as well as road changes updates (when plugged into the computer for updating) This was/is especially noticeable here in Los Angeles, where one of our major freeways (the 405) is undergoing massive changes, road closures, off-ramp closures, etc) Because TomTom CAN BE UPDATED NIGHTLY (if you so choose) all that pertinent map data is available right away. The Garmin couldn't keep up at all. It told me to go to offramps that I knew were closed. TomTom, had NO problems at all.
TomTom allows end users to make and submit map corrections from within the GPS unit, then those corrections are sent to TomTom, verified and put into an almost INSTANT update. To my knowledge, Garmin doesn't offer this kind of updating at all.
I admit I am biased, I had a TomTom before and I'm used to that interface.
The TomTom is almost $150.00 CHEAPER than the Garmin.
When you're driving an RV of any length, be it a Casita or a 40' DP, you want current correct information, not be led down blind alleys or low clearance bridges.
WoodGlue