Laptop - Graphics and Video editing

Any Apple laptop with at least 16GB of RAM with as much Flash storage as your budget allows for is a good choice.  As far as M1, M2, M1 Pro, M2 Pro, M1 Max, or M2 Max goes, it's not a question of if it will do it but a question of how quickly it will do it.

What D fosse stated re recommendation against a laptop refers to the way most laptops with both an integrated IGP enabled and a discrete GPU are set up to display. You see, most such laptops automatically switch between GPUs for the main display depending on the end use case. And that can - and does - cause problems with content creation apps in the first place. These laptops fail to recognize that content creation apps use the GPU relatively heavily (in other words, not content-app-aware).

Desktops with both GPUs enabled will not have this problem (unless you have monitors connected to both the GPU and the IGP) because typically only one GPU is used to display.

 video editing (vids will likely be in 4k)

 

I'm a bit concerned this isn't going to be able to run smoothly

By @Mel030812

You are right.  4K might be a problem, even using proxies:

https://helpx.adobe.com/premiere-pro/system-requirements.html

Also, you will need much more hard drive space for the cache files.

Have a look here:
https://www.pugetsystems.com/solutions/video-editing-workstations/adobe-after-effects/hardware-recommendations/

and here:

https://www.pugetsystems.com/solutions/video-editing-workstations/adobe-premiere-pro/hardware-recommendations/

I can tell you right away that for Photoshop, dual graphics is going to be a problem. You'll probably need to completely disable the Intel UHD. Photoshop uses the GPU for actual data processing, and the result returned to Photoshop for further processing. You can't send data to one GPU and get it back from the other. It's not a simple downstream flow like in other simpler applications.

The T600 (apparently the next generation of the "budget Quadro" P620) should work well for now. Not high-end, but it shouldn't give you any problems.

You will also need a bigger system drive for the Photoshop scratch disk. Photoshop handles huge amounts of data, much more than any RAM you may have installed. The scratch file contains all history states for all open documents plus overhead, orders of magnitude bigger than your nominal starting file sizes. 1 TB should be considered minimum - and that does not include space for your documents and assets.