Stable Diffusion

I want to buy a new GPU mainly for SD. The machine-learning space is moving quickly so I want to avoid buying a brand new card and then a fresh model or tool comes out and puts my card back behind the times. On the other hand, I also want to avoid needlessly spending extra thousands of dollars pretending I can get a 'future-proof' card.

I'm currently interested in SD and training LoRas (etc.). From what I've heard, the general advice is just to go for maximum VRAM.

• Is there any extra advice I should know about?
• Is NVIDIA vs. AMD a critical decision for SD performance?

I'm a hobbyist, so a couple of seconds difference in generation or a few extra hours for training isn't going to ruin my day.

Some example prices in my region, to give a sense of scale:

• 16GB AMD: $350
• 16GB NV: $450
• 24GB AMD: $900
• 24GB NV: $2000

edit: prices are for new, haven't explored pros and cons of used GPUs