It depends on my mood and what i am trying to achieve. Right now i am loving the automation track for trial runs. Grid map is the first map i play when testing out a new car or setup. I also like ghost desert for making "Mad Max" type scenarios. Utah has great offroad action for 4x4 and rally driving. Its just really hard to pick :\
Definitively Italy! Reminds me a lot to my home town in south Italy, love the country side as much as the towns and the little stretch of highway is amazing.
Fav map: Mod crawl central Reason:, the crawling it offers is better than any other map What can be improved:Last update outdated it, to the point tha nothing but the base terrain is created, just a bunch of yellow signs, hate to see this mod go to crap
My favourite so far is Utah, but maybe just because I haven't spent a lot of time elsewhere. Need to do more exploring
My favourite map is Italy, because it looks really realistic and accurately made. As for mods, probably Polish Roads, as it reminds me on my country, with communist building blocks, etc.
Mine would be Italy because I can go full on touge driving in the map especially on the hilly part of the map.
I use the grid a lot and the Derby Arenas are great for stuff that doesn't need a lot of room. Oh and I love the CrashHard maps.
I do like my deserts - Utah is my pick, simply because it has so many interesting roads/trails, especially after the refresh. @Crash Hard 01 's Long Desert Road Map is also one of my picks - simply because it's possible to get just about any vehicle to its top speed on a dirt road there. @DuneWulff 's Dust Bowl gets a mention for being able to break just about anything.
For me, I'm torn between East Coast USA and Italy. Since ECA was revamped, it looks and generally feels great to drive within. Italy is great all around; my favorite section of the is "Città Vecchia", I really like the layered road layout and the bridges.