[Oni]

Played for almost 20 years, but lost interest after maxing. Still love RS3, but I've been playing OSRS for a fresh start. I'd say try both, see which you prefer. There's things that make RS3 vastly different than it was originally, like (MTX/cosmetics/double XP). There's also many things that make OSRS different than the game was in 2008 (QoL changes/skill reworks/retrofitting).

I honestly recommend playing both for a more complete perspective. There's a unneeded hatred between the two games, which has fragmented the player base.