CS2's New Crosshair Options Change How Players Share Their Settings
Valve's September 30 changes expand customization, followed by a grenade-crosshair fix on October 2.

CS2 Crosshair Options
Counter-Strike 2's crosshair updates are about more than choosing another shape. Valve has expanded the settings that travel with a share code, added an outline-color option and introduced the Static Quadrant style. For players who copy a teammate's setup, that makes the export itself worth checking again.
What the New Options Actually Change
The September 30 notes add outline colors and Static Quadrant, allow negative gaps for the classic dynamic style, and change that style's alpha increments to 0.01. Valve also reports a correction to the visualization of weapon inaccuracy and spread.
Those are presentation and configuration changes. They should not be read as a promise that a particular crosshair improves weapon accuracy. The useful test is whether your chosen shape stays readable against the backgrounds and effects you encounter during a match.

CS2 Crosshair Update Timeline
Share Codes Now Carry More Preferences
Scope-dot scale and color are now included in the new share-code format. Valve says the format changed to accommodate the additional settings. That is a good reason to generate a fresh code after finalizing your setup, rather than assuming an older saved code captures every new preference.
For context, Valve's September 23 explanation describes crosshair thickness and length in pixels, with automatic rescaling when display resolution changes. A copied list of numbers is therefore less useful without knowing how the resulting crosshair looks at the resolution you actually use.
Grenade Crosshairs Work During Freeze Time
The September 30 update enables grenade crosshairs during freeze time when a grenade attack button is held. On October 2, Valve followed up with a rendering fix for grenade crosshairs at a thickness of three pixels, and updated the workshop convar whitelist for the new settings.
Before a serious match, use a practice session to check your normal aim marker, scope dot and grenade setup separately. Keep a copy of the configuration you already like, then change one setting at a time. That makes it easier to decide which change helped readability and which merely looked different.
The details above are drawn from Valve's dated announcements in the official CS2 news feed, not from an untested claim about a universal “best” crosshair.