Lugoae also work as a decent anvil in hammer and anvil tactics, as they die slowly enough against heavier units for your Leuce Epos and Brihentin to outflank and charge the enemy, and are also cheap enough to hire and maintain so you can recruit some heavy cavalry to work as a hammer and elite swordsmen for capturing cities.
I personally prefer Gaelaiche (available in Transalpine Gaul from the age of bondsmen onward) and Batacorii in my field armies though. They have better stats than either Lugoae or Gaeroas, and since Age of Bondsmen is fast to achieve and you're going to take those Belgae towns anyway, they're rather easy to recruit en masse. I do prefer Arverni over Aedui though, so I might be looking at it from a wrong angle. Anyway, it's really up to everyone's personal preferences and you're free to play Lugoae if you feel like it. They're probably worth every penny one pours into them.
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