My experience in keeping my hand warm while riding in cold weateher, in order of effectiveness:
1. Hippo Hands-type handlebar muffs (mine are from Tusk)
2. Heated gloves (mine are Warm n Safe)
3. Heated grips ( I use Oxfords)
While I use all three in cold weather, if I had to pick only one, it would be the muffs as being the most effective when used alone. They are also the cheapest, and most easily moved from bike to bike.
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"Chet from Chattanooga"
2009 KLR, blue