Have some time in a Cherokee 180 and 235. A little narrower than the 172 but do able.
All PA-28s, from the humble -140 to Turbo Arrow, have the same cabin dimensions in the front seat area. They are a couple of inches wider at the elbow than is the C-172. But as with most low-wing aircraft, the rounded upper cabin cross-section begins tapering inward above the lower window line, so the upper corners seem closer to the pilot's head. C-172 cabin sides, on the other hand, are nearly vertical all the way up to the ceiling -- which is higher than the PA-28's. Seating posture is more upright, more SUV-like, than the sedan-like PA-28.
Of course, a downside to the 172 is that the bottom of the wing root is just about a tall pilot's eye level.
Biggest difference is in back seat room for an adult in the 180 & 235. That's supposed to be better in the Archer II I think. I know in the 235 series when it went Dakota, and a few years before that issue was addressed.
All PA-28s before 1972 had the same fuselage dimensions aft of the firewall, with cozy rear-seat room. The trainer-model -140 was even worse than the others since it was originally intended to be only a two-seater.
The Arrow got a seven-inch fuselage stretch with improved rear seat room, along with longer wings and stabilator, for the 1972 model year ("Cherokee Arrow II").
For 1973, the same changes were applied to the Cherokee 180 and 235. In 1973 only they were dubbed "Cherokee Challenger" and "Cherokee Charger" respectively. After Chrysler Corp. squawked over Piper's use of the muscle-car names, the airplanes were renamed "Cherokee Archer" and "Cherokee Pathfinder" beginning with the 1974 model year. The taper-wing "Cherokee Archer II" came along in 1976 and the Dakota in 1979. Nevertheless, cabin dimensions in the PA-28 line never changed after 1973.
Pipers typically carry more weight than the equivalent Cessna. It's certainly worth looking at it.
Not necessarily. Depends on the individual model, year and equipment.