I would have chosen the same options in bundle 2 and 3. With regards to bundle 1: The 25 upgrade credits is a no-brainer IMO. So IMO the choice is between the 10 upgrade credits and the 50% miles bonus.
If youŽre sure you will only be doing 20k-40k miles, IŽd probably choose the upgrade credits. For anyone doing more than 40k miles (mostly on AC/UA/CO where you earn the 50% miles bonus) I tend to recommend the miles bonus.