The 170B has 123 lbs more usefuel load than a new 172.
The 170B uses 327' less runway for takeoff, and 60' less distance to clear 50' obstacle, than a new 172.
It requires 150' less runway to land over a 50' obstacle.
It stalls 2 mph slower.
It has 2,000' higher service ceiling.
On the other hand the new 172 has 60 miles more range (because it carries 15 gals more fuel).
The new 172 cruises 15 mph faster (but uses 80% power vs 65% to do it, burning approx 2 gph more fuel. At the same power settings both airplanes have nearly identical speed and hourly fuel burn.)
The 172 is definitely quieter inside.
The 172 costs 6-times as much as a 170 (almost $200K more than a 170.)
The 170B costs half as much to insure, primarily the result of hull-value calculations.
Oh, yeah.... The 170 is prettier.
