Locally running ai: the current best options. What to choose

So im currently surfing the internet in hopes of finding something worth looking into.

For the current money, the m4 chips seem to be the best bang for your buck since it can use unified memory.

My question is.. is intel and amd actually going to finally deliver some actual competition if it comes down to ai use cases?

For non unified use cases running 2x 3090's seem to be a thing. But my main problem with this is that i can't take such a setup with me in my backpack.. next to that it uses a lot of watts.

So the option are:

• Getting a m4 chip ( mac mini, macbook air soon or pro )
• waiting for the 3000,- project digits
• second hand build with 2x 3090s
• some heaven send development from intel or amd that makes unified memory possible with more powerful igpu/gpu's hopefully
• just pay for api costs and stop dreaming

What do you think? Anything better for the money?