completely unpredictable, but my guess would be that we would be ahead.
no world wars means a lot of people stay alive, 150-200million alone because they don't die from the spanish flu (there is a chance it will pop up, but much less extreme).
ww1 - 38M military & civilian casualties
spanish flu 150-200M
no ww1, so russian revolution goes different, no purges & holodomor - 10-20M
ww2 ~80M
especially the flu & ww1 survivor are going to make a big difference, expect more emigrants from europe to colonies.
all tose people surviving likely will give a lot of extra inventions, also it will boost economy and thus development. different economic cycle (different depression, probably less deep)