The RTX 4070 Ti Super is the better card. Whether it's the better buy depends almost entirely on whether 16GB of VRAM actually matters for what you play.
The real gap
Used, the Ti Super runs $354.99 more than the standard Super on ChipFlip's tracked listings, a steep 68% premium. What that buys: 16GB of VRAM instead of 12GB, a jump from 7,680 to 8,448 CUDA cores, and a 256-bit memory bus instead of 192-bit. Real-world performance comes out around 5 to 10% higher for the Ti Super, a modest gain that undersells how much the VRAM increase actually matters for texture-heavy or modded games specifically.
Why the VRAM matters more than the FPS number
A 5 to 10% frame rate gain alone wouldn't justify a $354.99 premium. The 33% jump in VRAM capacity is the real reason to consider this upgrade, and it matters more the longer you plan to keep the card, since VRAM requirements in new titles only trend upward.
When the standard Super is the smarter buy
Building fresh with a tighter budget, or gaming at 1080p to standard 1440p without heavy texture mods. At that scope, 12GB is still comfortable, and the standard Super delivers most of the performance for a lot less money.
The takeaway
Buying for 4K, heavily modded games, or a build meant to last several years: the Ti Super's extra VRAM justifies the steep premium. Everyone else building a straightforward 1440p rig should keep the standard Super and put the $354.99 saved toward the rest of the system.