Tessellated polygons are just polygons in the end of the day, so any difference is down to drivers I'd guess.
DX 10 was not a massive success, and DX 11 cards aren't common yet. There's no telling if tessellation will ever be a big hit with designers. There are other ways of doing what tessellation does.
The Nvidia v ATI thing is as old as the hills and everybody has their own opinion. I can't look past ATI myself for the power management alone.
If you live somewhere hot it should be a no-brainer... a high-power card will be working against your air conditioning, basically doubling the power wastage. I've no a/c and the heat is a nuisance in summer. An Nvidia card would be even hotter still.
dduff
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