Which of the 16gb VRAM qwen3.8 27b’s is the best?

I’m having a hard time finding out which one gives you fastest speed, maximum context with best possible quality.

I can run unsloth qwen3.8 27b iq4_xs with 65k q8 kv, context without MTP and vision offloaded to cpu. But also kinda slow for agentic work at like 30ish tok/s )I mean it’s acceptable)

But that is like bare minimum for harness stuff,

I know many people use Q3 quants but are Q3 quants really safe? Like you gotta think I won’t only be using it for vibe coding, but also general tasks.
Where general knowledge quality would be nice to keep intact.

There are so many quants like
IQ4XS smaller,
Or GRQ or whatever those quants are called or YMQ, I don’t even know anymore.

Which one is the best?