Want to upgrade from Cerwin Vega VEGA series 10" sub in sealed enclosure.

Problems with the question:
Audio is subjective
You don't clearly define what's most important when defining better
No one can say which will be most reliable because no one knows how they will stand up to your use
There are virtually no specs and those present are vague
There are no response curves
No one can say which will work better (even if 'better' was well defined') in your vehicle
Virtually all are rated lower than your amp's output rating and there is virtually no chance that you're going to use less than full power from your amp
Slim-mount woofers typically have less output than a normal woofer
Thin enclosures typically have less output than an equal volume deep enclosure

If the current CV 10 is 'almost there', why not upgrade to a CV 12 of the same series and drop it into the enclosure you have and if the enclosure is still too large for that woofer, you can fill it to make it the right size (or cut it down if you have the ability to do that).
 
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