Computer advice. Sorry if this has been done 1000's of times already

AI Denoise is almost exclusively GPU-based, so performance goes up a lot on more recent GPUs and more powerful GPUs. All of the options below will do AI Denoise faster than your current Mac. The conclusions below are from watching a number of stress tests by the ArtIsRight and MaxTech channels on YouTube, so you can check those out if you want.

The way it works out for your choices are:

MacBook Air: Probably avoid. Although it will process AI Denoise much faster than your current Mac, it will be slower than any of the Macs below.

Mac mini: This can work. Upgrading the processor to M2 Pro may cut AI Denoise time a little more because it has a third more GPU cores than the M2. Important: If the cost of the Mac mini approaches $1999, consider getting the base Mac Studio instead, because at that price the Studio has an M3 Max with almost double the GPU cores of the Mac mini M2 Pro, and 32GB Unified Memory.

MacBook Pro: Consider the 14"/16" MacBook Pro, because they have a good balance of GPU power and cooling. But for AI Denoise, consider avoiding the base M3 MacBook Pro, and going up to an M3 Pro or M3 Max instead.

Current M2/M3 models may bring your AI Denoise time to around one minute or below per image. For even faster AI Denoise processing, upgrade the above Macs to an M2/M3 Max or Ultra, which have many more GPU cores and can cut that time down to around 30 seconds per image or less, depending on the number of megapixels.

If you are going to do batch processing (run AI Denoise on a large number of images at once), you have to think about cooling. Batch AI Denoise will max out the GPU, and if you do that for at least a few minutes, the Mac will reach its maximum temperature. If the Mac has no fan (MacBook Air), it must slow down to stay within temperature limits. The Macs with fans can continue at full speed. Note that the base 14" M3 MacBook Pro has only one fan, so if you are serious about batching AI Denoise, upgrade to the M3 Pro or M3 Max model which have two fans and more GPU cores. If you want the fastest possible bulk AI Denoise in a Mac laptop, upgrade to the 16" because the larger size gives it a higher capacity two-fan cooling system. For the fastest possible bulk AI denoise in a Mac desktop, you probably want the Mac Studio with M2 Ultra (60 GPU cores, or 6 times more than a MacBook Air) and its beefier cooling system.

If you go Windows, same thing: Discrete GPU is strongly preferred over Intel integrated graphics, and the more powerful the better. Relatively few Windows laptops have a discrete GPU. Also be aware that many Windows laptops throttle down both the CPU and GPU on battery because of both wattage and heat concerns. That is much less of a problem with Apple Silicon Mac laptops, which can run CPU and GPU at full power on battery largely because they can get the same work done with fewer watts, which also generates much less waste heat, for less fan noise. The fastest AI Denoise on any platform is, I think, a PC with effective cooling and a monster new graphics card (e.g. RTX 40xx) where the GPU alone can cost as much as a Mac, and the whole thing consumes hundreds of watts. But that can get AI Denoise down to 10-15 seconds per image.

This linked chart summarizes a lot of this, using an A7r IV raw file:

https://www.fredmiranda.com/forum/topic/1804640/17#16330477

In all cases above, it is strongly recommended that it have 32GB Unified Memory or more. The MacBook Air and Mac mini can only take a maximum of 24GB, but that can be OK if you’re on a budget.