[cobookman]

You get the best discount by paying fully upfront. If you do this, the AWS bill doesn't show the RI on your monthly bill what-so-ever. Leading to a suprise 3 years down the road.

[user5994461]

And more importantly you're engaged to pay for the full year no matter which option you pick, with (almost) no possibility to cancel.

Long story short, only play 1 year full upfront.