What's the difference between Strix and TUF Gaming version of this card?

Either lazy or a child. Too broad of a question. There are many differences, all of which are listed on the manufacturers website.

Questions & Answers: ASUS ROG Strix GeForce RTX 4070 Ti SUPER OC Edition Gaming Graphics Card (PCIe 4.0, 16GB GDDR6X, DLSS 3, Massive vented backplate, Power sensing, Aura Sync) ROG-STRIX-RTX4070TIS-O16G-GAMING

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ASUS ROG Strix GeForce RTX 4070 Ti SUPER OC Edition Gaming Graphics Card (PCIe 4.0, 16GB GDDR6X, DLSS 3, Massive vented backplate, Power sensing, Aura Sync) ROG-STRIX-RTX4070TIS-O16G-GAMING

Powered by NVIDIA DLSS3, ultra-efficient Ada Lovelace arch, and full ray tracing
4th Generation Tensor Cores: Up to 4x performance with DLSS 3 vs. brute-force rendering
3rd Generation RT Cores: Up to 2x ray tracing performance
OC mode: 2700 MHz (OC mode)/ 2670 MHz (Default mode)
Axial-tech fans scaled up for 31% more airflow
3.15-slot design: massive fin array optimized for airflow from the three Axial-tech fans
Diecast shroud, frame, and backplate add rigidity and are vented to further maximize airflow and heat dissipation
Digital power control with high-current power stages and 15K capacitors to fuel maximum performance
Auto-Extreme precision automated manufacturing for higher reliability

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