Which one to get zumo 660 or 390??

Which would recommend the 660 or 390. I know the 390 doesn't have mp3 which is fine. Both have Bluetooth great. I will need it for road and offroad use and loaded with T4A maps. The 660 is discounted which makes me wonder if it breaks and needs repairing will there be support for it?

Price wise you can get a 390 for R5000 new and 660 secondhand R3500. And then still need to buy T4A maps R900.

Your thoughts