Yet another question of sealed 10 & 12 vs ported 10?

So: I have decided to upgrade from my current sub: which is a sealed cerwin vega VEGA series 10". I can only get 1 sub due to space constraints, and yes, two is too wide unfortunately. I can either swap out the vega for something a bit more powerful (ported or sealed), or I can go up in size and get a 12" (sealed).

What would y'all recommend? I have a 1.05 cu.ft sealed box.
 
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