Almost 40 years separate these: time that has given one of them electronic shifting, thru axles, disc brakes, carbon forks and compact geometery.
Both frames are beautifully made by skilled people …..
… the one on the left is lighter, quieter and does off road things better (due to the bars) That notwithstanding, I’d give shed room to one like the young upstart - with wider bars, analogue shifting and not carbon forks - they make a lot of sense and handle really well.