Lidgar
Gongfarmer
That is really a subjective question and depends on your taste. What I find to be “better” you might not like at all.And the point of me adopting a new system is that it supports some sort(s) of gameplay better than the systems I already have.
What is Shadowdark/B-X/AD&D/3E/5E/DCC/Powers and Perils/ going to do better ?
For me, Shadowdark takes the approach of a B/X game in terms of power levels and hangs it on a very stripped down 5e chassis, including the Advantage/Disadvantage mechanic and Inspiration (luck tokens).
It then introduces new mechanics like the torch timer, xp system, class mechanics, ancestry, etc. that differentiates it from other OSR games.
The rules are free and I encourage you to read if you haven’t already them to learn more.