Went through the WoT page explaining the system for the month of December for the twitch drops, and here is my breakdown if it’s worth the hassle in order to get a tier 8 premium tank with spending no cash.
Festive tokens
Here is the overview of the rewards for December:

The main rewards are the 2 tier 8 premium medium tanks, the Strv 81 and Object 274a. In my opinion, the 274a is a better tank, but none of them are OP by any means. They would be alright credit makers, both of the tanks have relatively high shell costs, which doesn’t make them very profitable in the long run.
If you skip a week of watching the streams, you can still get a tier 8 since the max amount of tokens is 120, and you get 20 for a full week of watching.
The rest of the rewards are kinda meh if you are not really into the 3D styles for the Maus and Vz 55. Premium account redemption is limited to only 1, which does suck for free-to-play players.
What to buy
If you collect 100 tokes or more, I would get a premium tier 8, since in the long run, you will get the most use out of it. If you value the accuracy and gun depression, grab the Strv 81; otherwise, the Object might be a better choice.
If you collect fewer than 100 tokens, the priorities for the rewards would go like this for me:
- Booster
- Premium Account
- 2D Styles
- Consumables
- 3D Styles
12 Days of Tankmas

In my experience, the chances of rare loot dropping are extremely low, so I would not bother watching streams on all 12 days, but only these:
Day 3 – December 5th
Progetto 46 – One of the best tier 8 mediums

Day 6 – December 8th
LT-432 – Light with armor, DPM and camo

Day 8 – December 10th
IS-3A – Reverse autoreloader, very broken mechanic

Day 10 – December 12th
Contradicious after only 90 minutes of watching and 1 Large box after 150 minutes

Day 11 – December 13th
Bourrassque – heavy hitting medium with light tank camo

Day 12 – December 14th
Turtle Mk.1 – TD with crazy armor and monster DPM

Keep in mind, the drop rates for premium tanks are low, but if you have time on these days, feel free to give it a go, you never know, maybe you get lucky and get a great credits maker without spending money.

