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It really depends on what you want to do, but in terms of value for streaming, Nvidia's 40-series cards are still well-positioned if you find them at a good price. The RTX 4060 is the most affordable and handles 1080p/60fps streaming without issues, while the 4070 already offers much more headroom if you're planning to do 1440p or even 4K. AMD also has some interesting options with the RX 7600, which is cheaper and enough for basic streaming. The important thing is to confirm what resolution and frame rate you actually need, because sometimes people buy way more processing power than they use.
Another thing to consider is whether you'll use hardware encoding (Nvidia's NVENC or AMD's VCN) or CPU, because that changes the minimum requirement quite a bit. If you're going to stream games and want decent quality without overloading your processor, Nvidia really comes out ahead. It's also worth checking if your power supply can handle it, because there's no point in saving money on the card and having to replace the PSU right after. What kind of content are you planning to stream - 1080p or are you going to try something more demanding?
For streaming specifically, what matters most is the hardware encoder, not raw power - so an RTX 4060 or even a 4050 Super can handle 1080p 60fps without breaking a sweat, but the real problem is VRAM. If you're planning to stream and game at the same time in high resolution, 8GB gets tight; 12GB breathes a lot easier. The thing people don't mention is that GPU prices fluctuate quite a bit in 2026, so what's more important than the specific model is checking whether your power supply can handle it and whether the game/application you use (OBS, Streamlabs) is optimized for that architecture - some updates tend to favor Nvidia over AMD and vice versa.
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