The Triple X Triple room is my favourite PVP room! It allows for quick initiation and the duel area is not too narrow or wide, just right for PVP. The flat and simple terrain enhances the maneuverability of characters, allows for a multidirectional input of skills and there aren't many obstacles that might obstruct some skills. Also, the colour tone of this room is easy on the eyes. I feel pretty comfortable fighting in this arena.
As compared to the other arenas...
Round Stadium - The area is too big for me and as the tiles are white I find it pretty glaring.
Treasure Room - Its space is bit too wide.
Gehenna Bridge - Too long and slightly narrow. Also characters can fall off the bridge -_-
Altair Colosseum - Too narrow... one way road.
Altair of Duskfall - Fighting space is too small and squeezy.
Laboratory - The dull colours and poor lighting make me gloomy.
Silent Maze Sanctuary - Running for the Olympics.
Off topic: I found it! Back to the post on Soltiegus hating red haired people http://asphyxiia.blogspot.sg/2013/04/rose-of-reminiscence.html
More side tracking:
This is by far the best Grandis cosplay!! She's so beautiful and she actually looks like Grandis <3