NSMB Wii of course!!

Get NSMB Wii. It will be epic.

i really almost made my mind up until i found out that some eople are saying that Trilogy will be hard to find in February....

does that mean that this game will only stay for a short time or will it be like a regular title which is always on the market like even after 3 or 4 years....if it is only going to stay on the market for a short time than i might as well as get it first......

Serious? Hmm that is a major factor to consider, one that sways it in the direction of Trilogy.

I was going to wait but if what you say is true then I'll snatch it up.

Ok, if you are gonna get both anywayz, you should get Metroid Prime Trilogy first. You will have 3 awesome games to pass the time. After you are done, you can just get the other one.

But you should get MP: Trilogy fast though, b/c I don't know how long will be out in stores

New Super Mario Bros Wii.
You seem to look forward to it more. Yes Metroid is epic, but there's still a chance you won't like it. Mario on the other hand...
Just saying, you have more of a chance liking New Super Mario Bros, and if by a slight chance you didn't like Metroid, you'll spend 2 months wishing you got Mario.
Here's a solution: Save $10, and rent Metroid trilogy once it's out. (if not in stock, get Corruption) after a week, you could decide what you want.

I mean mario and metroid : 2 games... but metroid could last longer ( sorry english is not my primery language...)

Have you already played the Metroid Prime trilogy?

Logic.  If you had played any of them, odds are you liked it and would have owned them, or else you would not have liked it and therefore wouldn't be asking the question in the first place :)

since you never played the primes i gotta recommend trilogy.....great value and extras