For now yes, mainly because my account is over 10 years old so I've already experienced that era and I actually enjoy the mechanics behind RS3 like EoC.
I'm older now so OSRS would probably be a lot more fun and enjoyable for me if I were to start playing but currently only have one laptop and can't play both at once so I'm sticking with RS3.
Once my new setup is finished I'll be playing both at once but most likely AFK training max on OSRS and focusing more on RS3.