When you give TW they can use it to play games or bid or maybe purchase something and earn a few VP and maybe some MRP.
When you give CW they can use it to purchase T-credits - 1 single = 102 VP
They can then use the T-credits to earn more VP and MRP
They can use the MRP to purchase more T-credits, and again more VP
This means they are using the original gift over and over again.
You can go and check this for yourself. Take a gift of $10.00. How many single T-credits can you purchase? (how many VP do you earn?) If you use those T-credits to earn double MRP and then use MRP to purchase more T-credits (more VP). Do the same with a gift of 10 T-credits will cost you about $20.00) and see how much you can earn. To me the answer is very obvious.
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In my opinion the CW is the best.
Here is my reasoning:
When you give TW they can use it to play games or bid or maybe purchase something and earn a few VP and maybe some MRP.
When you give CW they can use it to purchase T-credits - 1 single = 102 VP
They can then use the T-credits to earn more VP and MRP
They can use the MRP to purchase more T-credits, and again more VP
This means they are using the original gift over and over again.