If your new wood furnace calls for 6" pipe, then stick with that size. Using bigger pipe just results in a cooler running chimney that gets dirtier faster.
As far a double wall versus triple wall . . . you cannot judge the quality or performance of the pipe just by how many walls it has. The best pipe is the most fireproof (burn-out proof) and the most able to stay warm. Canadian specs call for pipe to withstand a chimney fire three times as long as US pipe specs.
Often the better Canadian pipe is not more expensive. Now, there may be more USA versions around that meet the Candian specs (I haven't checked lately).
Selkirk Canadian version SF Sentinel was the best on the market for years. CAN/ULC 4 S629 M84 Standard. Rated to 1200 degrees F continuous, 1700 degrees overfire for one hour, and 2100 degrees F for 30 minutes, three times - i.e. 90 minutes in all. It also has over 2" of insulation and stays very warm and clean.
The USA standard is lower: UL-103HT requires the chimney to withstand three 10 minute chimney fires at 2100°F. Rated for 1000 degrees F continuous.
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