It's time for the final installment (unless they put out an Episode 6, hint hint) of Yakuza vs Triads, where you find out which side you should pick. Here we go:


Chapter 2

The Yakuza Tier


The "Make An Example Of A Wealthy Industrialist" job drops the Yakuza-only Lloyds Spectre (vehicle; 18 attack, 45 defense). This is the best-in-slot defensive vehicle. It also costs a Pirate (consumable from Bangkok business) to do this job.



The Triad Tier


The "Extort The Head Of The Hong Kong Polo Club" job drops the Triad-only Type-103 Machine Gun (weapon; 42 attack, 29 defense).



Conclusion:

Note that the Yakuza job drops a good item you will want but the Triad job does not cost a pirate. If you are short on pirates, consider picking Triad until the final time through the tier, and then switch over to Yakuza to give yourself permanent access to the Yakuza-only Lloyds Spectre. If you have plenty of Pirates, just pick Yakuza every time.


Chapter 3

The Yakuza Tier


The "Sneak An Industrial Spy Into Hong Kong" job drops the Yakuza-only Cleaver (weapon; 25 attack, 44 defense).



The Triad Tier



The "Kidnap One Of Wei's Trusted Advisors" job drops the Triad-only Monk's Robe (armor; 29 attack, 41 defense).



Conclusion:
The Monk's Robe (Triad) is garbage and the Cleaver (Yakuza) is not. Furthermore, there is no difference in consumables between Yakuza and Triad. Opt for Yakuza every time here.

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TLDR:

Chapter 2: It depends on your current number of pirates.

Chapter 3: Yakuza, every time.