I would theorize it's easier to convert from OSR to 5e than from OSR to 3e.

Quote from: RPGPundit;1053468I would theorize it's easier to convert from OSR to 5e than from OSR to 3e.

I've done both - indeed I'm currently running an adventure written for 1e AD&D (1987's GMP #4 The Awakening) in 5e D&D, which I previously ran in 3e D&D, 15 or 16 years ago. I came across some of the old 3e conversion notes and yes converting to 5e is somewhat easier I think, though in both cases it's mostly just plugging in that edition's version of the appropriate monster stats. Sometimes 5e raises problems that don't arise in 3e, eg for some reason 5e Ankylosaurus stats are pathetically weak, and there are a few other 5e monsters like that, eg fire beetles and hyenas. But it's not hard to create suitable replacement stats.

Overall 5e is a much more robust system than 3e at higher level, you rarely get a situation where the PCs are easily squashed or can trivialise the adventure, as happens commonly in 3e.

Not having to worry as much about feats and some of the other details are what I think would make 5e easier to convert.