The best replacement for thalmor is stormcloaks.

The best alternatives to thalmor are rated as following:
★★★★★  stormcloaks
★★★★  altmer
★★★  hammerfell
★★  nords
★★  argonians
★★  telvanni
★  imperials
★  blades

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Speaking about thalmor, one probably shouldn't forget about imperials.

Other search terms related to thalmor and their ratings are:
★★★★★ imperials
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thalmor
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