I've lifted and run at various times in my life, and I found running a lot more rewarding, especially with all of the bad advice out there that surrounds lifting.
After the past 5 years of mostly running (with some time away at times due to injuries), I went from a 12 minute mile to a sub-7 minute mile in 3 years (with 1 year not doing much in the way of exercise). Consistency with the frequency of exercise matters a lot.
A 5 minute difference. Which is amazing. But only to other runners.
Going from a 50kg (110lbs) squat to a 130kg squat (286lbs) in 3 years is almost trivially doable (I've once gone from 50kg to 100kg in 3 months) and is impressive to everyone.
As much as we'd like our motivations to be pure, we really really really like impressing our friends.
I did make very very quick gains by "just lifting" and so felt very differently about it. These gains were both in strength and body composition, and within only a few months I found that I could impress people. Not at all like running: it's years and I still can't run an 8-minute mile.