There are 3 tribes in normal server and 5 in celebration and pandora server:
1. Romans
2. Gauls
3. Teutons
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4. Huns
5. Egyptians
Each tribe has their own tribe skill, hero skill, and special building. Their units, merchant, and wall are also different. Please consider their advantage and their weakness before choosing your tribe. All of the tribes have a chance to win this game, you choose your tribe according to your own playstyle.

ROMANS

Basic Explanation:
Roman is a balanced tribe, both defense and offense. They have the highest attack power for infantry unit (Imperian) and the highest infantry defense (Praetorian). They also have the highest attack power for cavalry unit (Equites Caesaris). Their biggest disadvantage is their units cost are very expensive.
Tribe Skill:
They can queue resource field and building simultaneously.
Hero Skill:
Fighting strength +100 attack power per skill point instead of +80.
Special Building:
Horse Drinking Trough: Reduce the training time and crop consumption for Romans cavalry.
Merchant:
Capacity: 500.
Speed: 16/hour.
Bonus: Trade Office merchant capacity by +20% per level instead of +10% per level.
Wall:
City Wall: Highest defense bonus but easy to destroy.
Unit:

Source: travian.kirilloid.ru

GAULS

Basic Explanation:
Gaul is a defensive tribe. They have the fastest cavalry (Theutates Thunder). They have very good defensive units, both infantry and cavalry. Their disadvantage is not a really good attacker compared to Romans and Teutons.
Tribe Skill:
+200% Cranny capacity.
Hero Skill:
+5 speed/hour if equipped with horse.
Special Building:
Trapper: Defensive building to traps attacking units.
Merchant:
Capacity: 750.
Speed: 24/hour.
Wall:
Palisade: Medium defense bonus and medium durability.
Unit:

Source: travian.kirilloid.ru

TEUTONS

Basic Explanation:
Teuton is an offensive tribe. They have the cheap unit and the cheapest unit (Clubswinger) in normal server. They have very good offensive unit but with cheaper cost and faster training time. But they also have defensive infantry with the highest cavalry defense (Spearman). Their disadvantage is lack of defensive points, cheap and high attack offensive units with the cost of very low defense points.
Tribe Skill:
None.
Hero Skill:
+20% Cranny Plunder.
Special Building:
Brewery: Increase the attack of all attacking units at the cost of Chiefs’ persuasion by -50% and Catapults can only target random.
Merchant:
Capacity: 1000.
Speed: 12/hour.
Wall:
Earth Wall: Lowest defense bonus but hard to destroy.
Unit:

Source: travian.kirilloid.ru

HUNS

Basic Explanation:
Hun is an offensive tribe with nearly no defense. They have cheap and fast cavalry. They have very good offensive cavalry unit. They have the highest attack power for cavalry unit (Marauder). Their biggest disadvantage is they are nearly have no defense.
Tribe Skill:
None.
Hero Skill:
+3 speed/hour when accompanied by cavalry.
Special Building:
Command Center: Can train 3 Logades in non-capital villages.
Merchant:
Capacity: 500.
Speed: 20/hour.
Wall:
Makeshift Wall: Lowest defense bonus and easy to destroy.
Unit:

Source: travian.kirilloid.ru

EGYPTIANS

Basic Explanation:
Egyptian is a defensive tribe with very good defense. They have very good defensive unit, both infantry and cavalry. They have the cheapest unit (Slave Militia) in the game. They also have more resources production in some ways than the other tribes. Their disadvantages are they lack of good offense unit and very expensive unit especially Nomarch.
Tribe Skill:
None.
Hero Skill:
Resources production +12 all resources (+40 for single resource) per skill point instead of +6 all resources (+20 for single resource).
Special Building:
Waterworks: Increase oases bonus.
Merchant:
Capacity: 750.
Speed: 16/hour.
Wall:
Stone Wall: Medium defense bonus and hard to destroy.
Unit:

Source: travian.kirilloid.ru

Which Tribe Should I Choose?

If you’re playing this game for the first time then Gaul is your best choice. This tribe is the best one for newer player because you can play the game and learning the game safely. You don’t really need to online all the time. Just focus on learning how to not getting farmed (when other players keep raiding your village) and learn how to settle your second and third villages.

If you’re a returning player or mediocre, already know the basic stuff and you know how to not getting farmed. If you want to spend your money (gold) in this game Roman is your best choice to learn this game, if you have a lot of free time Teuton is your best choice, if not both of them Gaul is your best choice. Don’t get me wrong, you can still choose Roman and Teuton even if you’re not using gold or have a lot of free time but it’s not as effective as it should be. Feel free to choose whatever you like because the best tribe is according to your playstyle.

Hun and Egypt are for experienced players. I don’t know why people recommend Egypt for newer player, it’s hard to learn how to farm and how to level up your hero with Egypt. If you can’t use it, you’ll ended up like dead turtle.