Do you think that a puma i a reliable choice wuth mech truck in the place of the luch ? kike paired with mg's and volks. for 1v1 and 2v2 btw.
I'll speak to 1v1s.
Mech is more or less dead in the 1v1 meta.
UKF hard counters it between AT snipers, AT sections with their super long snare range, and the snaring AEC. Obviously the sniper won't 1v1 a luchs, but all of that AT + snares means the luchs isnt worth going, and the puma means that you're going to be bleeding like crazy since you dont have healing; especially since volks lose to 5 man sections pretty handily in a lot of situations.
USF meta does favor either an m20 or AA HT as far as im aware, but even though the puma can end up having an impact, you end up investing way more resources into countering the vehicles than he spends on the vehicles themselves. If you do shut down the enemy's vehicle play without losing your puma, then the enemy can just pivot to an infantry heavy build with weapon upgrades and the puma will go back to doing very little, so its the same case as above: you want to combat infantry and going puma cripples your ability to do that since you'll either lack healing or have to constantly put down medkits when you actually need to the muni on combat abilities and upgrades (incendiaries and stgs).
Against soviets, a puma isnt going to do anything against maxims, and guards will provide a constant threat against the puma, making it more micro than its worth.
Short answer: No. Don't go mech. If you do go mech, then dont go puma first. But really, don't go mech unless you really have something specific in mind.