My personal comparison of TSER (Total Solar Energy Rejected) data among brands. Do take it with a grain of salt.

Tint series that belong to same tier will provide comparable (but not exact) heat rejection performance.

Tint series that belong to higher tier provides higher performance but generally costs more.

Consider also the warranty length. 5-7 years warranty are pretty common now.

Tier 1:
V-Kool VK and X series
Nano-Tech Clear Sky series
Huper Optik X3 Ceramic, Nano-Ceramic and Clear Ceramic series
SolarGard LX and Silver series
3M CR series
Llumar Ultra Performance, SpectraSelect and Windshield series

Tier 2:
V-Kool K series
Nano-Tech VIP, Charcoal and Reflective series
Huper Optik Klassisch, Klassich Black and Shield series
SolarGard HP and Sterling series
3M BC, CS, FX-HP and MS series
Platinum MNSR series
Llumar Deluxe and High Performance series

Tier 3:
V-Kool OEM series
SolarGard Non-HP series
3M FX-ST series
Platinum MX and MBSR series
Llumar Standard and Premium series