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Each new round should ideally be played on a new map template to keep things interesting.
Regarding the size, you can choose to play on either L+U or XL.
For comparison, here are the area figures. Let's take the smallest map, S = 36x36 cells, as our unit.
S+U = 2xS
M = 4xS
M+U = 8xS
L = 9xS
XL = 16xS
L+U = 18xS
XL+U = 32xS
The sizes L, XL, and L+U are optimal for gameplay. For example, I personally prefer dirt roads, so I would restart the game if it generated paved roads. You can also move around the map without roads. I recently played a game on an L-sized map with a foreign player, and we both enjoyed it; the generation was good, and there were no bugs. Not all tournament participants prefer rushing or are at a level where they need to break the enemy's defenses on turn two. On average, a game on a medium-sized map (L+U) ends around turn 136. Therefore, playing on XL+U is a waste of time and, frankly, a perversion. The fun of the game lies in interacting with your opponent, not just clearing out neutral creatures. The main thing is that the template supports the size.