All aluminum is not a good idea if you are planning on being hard on it, even a little!
The best use of aluminum in my opinion is to use it to reinforce and or replace key components that:
1- needs to be metal (example melting due to high heat)
2- would fail less of the time being aluminum instead of plastic
3- wilk reinforce the structural integrity of the car.
In an all aluminum car, bending and or breaking is guaranteed when ugly happens. Factor in the price of replacement aluminum parts and it could be way costly in the long run than having plastic ones.
My advice:
1- price a stock MT with the necessary aluminum parts added and compare it to the MT Pro price. If the Mt pro is cheaper or close to the same price, then you can go with the MT pro and remove all unnecessary aluminum parts and sale them to buy stock ones and make a little money while not sacrificing reliability.
2- If the Mt pro price is way higher, I would go with the stock one with appropriate aluminum upgrades.
Lastly, it's your truck at the end of the day. You are buying it to have fun, so you can buy the one that YOU want. If appearance and the cool "it's all aluminum" factor is important to you, do not neglect it in making your decision.
Good luck!