Which OSRS client is best?

The most popular client to use is Runelite, which can be downloaded here: https://runelite.net/ (more plug-ins, customization options)

Other Jagex approved clients include:

• HDOS - https://hdos.dev/ (nostalgic early 2000's feel)

• Official Game Client - https://oldschool.runescape.com/launcher (via Jagex launcher)