I prefer using Ovi Maps on a touch screen device with a big screen - the Nokia 5800 is ideal for me.
The non-touch screen ones don't have access to the latest version of Ovi Maps, which I find excellent (the new beta even lets you download maps via wifi straight from the network, without having to load via the PC, wihch is awesome).
ETA: The latest version is available for the following.
Symbian^3: N8, E7, C7, C6-01
S60 5th Edition: N97, N97 mini, X6, C6-00, 5800XM, 5235 & 5230
Last edited by typical; Jan 3, 2011 at 12:10 pm