I love a good ramble.
The atmosphere in OOTW is very strong, and is
easily my favorite feature of the game!
I am no gaming guru though, so to clarify what I meant about length ...
Assuming you know both OOTW & Flashback by heart (say you've beaten them many times over the years) you could buzz through OOTW quite quickly. By comparison, FB would still take you a good long time even knowing what to do (content wise, I honestly believe FB has as much in 1 level as the full OOTW game)
Both are great games for different reasons, but Flashback offers more of everything that made OOTW good, (and improves on it) and eliminates the more annoying aspects.
I have multiple versions of both games believe it or not ... I have OOTW & it's sequel 'Heart of the Alien" for my Sega cd. I also have the 3DO version which has enhanced visuals. It is an awesome version of OOTW and if you don't already have it its well worth picking up, especially if you are already a fan.
FB is well worth playing through. I'd actually suggest both the versions you mentioned. The 3DO version has the cd perks ... fancier cinemas, voices, etc... But I have a soft spot for the original cinemas that use the in game graphics. In any event, like Austin said, Flashback is a winner on any platform.
![Cool 8)](./images/smilies/icon_cool.gif)