Alright people, here it is. Vote on your favourite map from TS and (optional) FS. Please post as to why you think that it is THEE best map, in your opinion. And please, don't just post (I like Cityscape), explain as to why WITH MORE THAN ONE SENTENCE it's a teh uber l33t map. Please don't turn this into an anti-WW made map thread either.
I'll start.
My favourite TS map is Grand Canyon. I like it because it's a fun map for a free-for-all comp stomp on a rainy afternoon. Blow all the bridges, and you've effectively taken out 2 of the A.I.s, allowing you to focus on the one on your side of the map. Once you've taken him out, wait for the 2 A.I.s to battle it out on the other side of the map, occasionally sending bombing raids to the A.I.'s bases, while building the ultimate defence area around your side of ONE of the bridges, and building up a sh!t load of disruptors. Once one A.I. on the other side is a clear winner, repair just the bridge you built defences on. That bottlenecks the A.I., allowing my Juggernauts and Mammoth mk. 2s to have a field day. Fly some disruptors over to the other side, while sending more disruptors across the bridge, and you've got a good 2 pronged assault going on, which no A.I can defend against if you have bomber escort and a second wave handy just in case.
The map is also fairly symmetrical, although the south side has more tiberium value, the north is easier to defend against pitiful attacks sent by an A.I.
I don't have a particularly favourite FS map, but I quite enjoy Dueling Islands, as it offers a great quick match against the A.I. if I need to kill a few minutes. The map is balanced, easy to defend your base, with a lot of exploitable tiberium in the immediate area. It also has a good chunk of land for you base. All around good fun for amphibious assault too (With a back door the A.I. doesn't care about or defend )
EDIT: I cut some TS maps out since I pretty sure most people downright hate 'em (plus there is limited space)