Speed and classic server (Travian 2.5) and normal differences. Here is a list of the differences between the servers.
There is no oasis
No knight
No hermitage
speed server
When the game was increased to 3 times faster (except for certain features, for this time divided by 3 times).
and each player only has 4 months to play is just a feature to try to be a good plyer travian
Classic server
There is no oasis and knight
There is no trap
Longer beginner protection
Resources can build up to level 12 for the capital, and other villages up to level 10.
normal Server
Resources can be upgraded up to level 20 for the capital, and other villages up to level 10.