This question comes up on a regular basis. And it brings out the Mac fanboys and PC fanboys, each with their individual biases.

So, from a person who supports both platforms -

You can edit images successfully on both.
You can get a Windows laptop with easily and cheaply updated storage and ram. Win laptops offer at a minimum 2 drive options, and some as many as 4 - two NVMe PCIe m.2 slots and 2 SATA drive bays.
Mac generally only offers a single drive, and it's up to you to use external drives to augment the single internal drive.
Windows machines cost less for similar performance, or for the same price point you get more bang for the buck with PCs.
Macs run longer on a battery charge.
Macs are lighter. Unless you add the external drive you'll need for the majority of your images.
Macs have a "Genius Bar" at local Apple stores where you can go when you get yourself into trouble. Not really an option with most laptop vendors, with a couple of exceptions.
Apple's 'high end" graphics solution is better suited for video production, as does their wide gamut DCI-P3 color space on their display systems. This is also available on Windows machines, plus you have the option of using NVidia display cards, some of which support 10 bit displays and Adobe RGB color space, for a better, more industry-standard photo editing experience.

In summary, there are few functional differences, unless you are looking at a "power user" type of laptop. This is where the Windows machine seems to be much stronger than anything from Apple. If you are ok with spending more money for ok performance, and you don't mind paying for their marketing hype, Macs are quite serviceable. If you want more options, custom configurations tailored for your specific use, then look at having a custom Windows laptop configured for you. It will cost you less..

Here is a comparison for a middle of the road MacBook Pro and a similar performing Windows machines with some differences noted. Windows all storage inside, faster cpu with more cores, faster gpu with more vram. It's hard to compare run time, because Apple uses watching movies and websurfing as metrics, not gaming or heavy duty cpu/gpu/disk access processing which you are more likely to see using photo editing programs. Faster cpus and gpus are available, plus you can add two more internal drives for the Win machine. I wish I could say more about the Mac, but Apple keeps things simple by limiting options and selecting those options based on pretty sophisticated marketing studies of how people use/intend to use their machines. With Windows, there are a myriad of configuration options, which makes it hard to decide, but there is no way to ignore, in this case, the $1100 price difference for two more-or-less equivalent machines. Yes, the Mac has more resolution, but along with higher resolution you need to consider that text prompts are smaller and harder to see, and honestly, I have used up to 5K machines and find that editing is not really any better than a good, solid HD display (1920x1200 or 1920x1080). If you want, in either case, you can get an external display - which I would recommend in either case anyway. I find editing on a small laptop display a bit challenging. Also, the Windows machines are available in 17" sizes.

15" MacBook Pro
2880x1800 res LED Backlit IPS display
2.6 gHz 6 core i7 cpu
1 TB SSD main internal storage (you can order it with up to a 4 TB SSD, but you can't change it yourself
32 gb ram
Radeon Pro 560X 4gb GDDR5 standard, you can order it with up to a Radeon Pro Vega 20 with 4 gb HBM2 vram.
4 USB-C/Thunderbolt 3 ports.
Seagate Fast SSD 2 TB external USB-C
Up to 10 hours run time (web surfing, movie playback)
Mac OS

Total price as configured - $3950.00

Comparably configure Windows Laptop

15.3" Sager NP9156
1920x1080 display, wide angle of view
Nvidia RTX2060 with 6 gb GDDR6 vram
9th Gen i7-9700K cpu 3.60-4.90 gHz - 8 core
32 gb DDR4 ram (2x16) user expandable to 64 gb
1 tb m.2 NVMe, PCIe drive
2 tb SATA III SSD
3 hr battery life.
Windows 10
Lifetime phone/email support, 1 yr parts included, other support options available.

Price as configured - $2841.00

https://www.xoticpc.com/sager-np9176-clevo-p775tm1-g-12415.html?startcustomization=1

I've been using and recommending Sager notebooks for the past 6 yrs and so far no hiccups. This vendor also offers, HP, Alienware, MSI, ASUS and possibly other high end laptops.

If you are on a budget, you may want to spend some time looking at the options at Xoticpc.com, or Costco, BJ's or Sam's Club - if you want a current machine. With your $800 budget I would advise against buying a 7 or 8 yr old certified Mac laptop - they have small, slow hard drives, generally not really enough memory or vram for photo editing, and very little storage that you will run out of pretty quickly.