Here's some good info (if you have the time) on the Titanic subs. Keep in mind, they are sealed, and are compact, so you are going to get a different sound as opposed to larger, vented enclosures. If you go back far enough, they discuss the 10" version. This thread deals with the 15".
http://www.avsforum.com/avs-vb/showthread.php?t=602452
Without comparing both subs in a room together, it's hard to say which is better overall. My experience with subs is that you'll get more usable dB with a larger amp in a smaller enclosure. You'll obviously need more power in a sealed enclosure - box size being equal, but we're not talking same sized enclosures.
You'll find larger vented enclosures yielding lower bass, but will run out of steam sooner with smaller amps. You have to take into consideration where most of the bass output is (what Hz), and determind if you really need a sub that plays extremely low but sacrifices a higher percentage of bass in the upper Hz bass range. In a small room, the STF-1 is great. But having a budget of around $350 in a larger room may push one towards a Titanic 10".
If you choose the right sub in the right size room, you can't go wrong. Jaxvon's STF-1 is perfect in a dorm room/smaller apartment, but it may not hold up in a larger 12x16 living room for overall bass output.