the only time ive had a drawing monitor (thats what i call screen drawing tablets) was when my dad bought a ugee one out of nowhere and i was forced to use it bc well my dad bought it for me (it sucks and i cant use it anymore bc the model is no longer supported aiyah) and that lasted for like 2 months more or less so I'm not too much of an expert but i am a bit tech nerdie

I know the xppen is on sale right now but do consider longevity and overall product build before considering if you are getting it for the sale or for the actual product (we get enticed easily i swear)
But yeah before everything everything, set your hard hard hard hard HARD budget. Do not shake! from that budget. After setting your hard budget, make a standard budget. that way, you can spend a little over the standard but you do not overspend/pass your hard budget.

In terms of size, never go below a 16" . I see that u're transitioning from an ipad, so if you're going to get a drawing monitor its best to always be minimum 16". The reason why I call it a monitor is because it quite technically is a monitor which you can draw on. Unlike tablets like the samsung galaxy tab or ipad, those can function on their own. Drawing monitors are just monitors. Extra displays/heightened display. There is no point in getting something 13" if you already have an ipad since ipads are already close to 13". Also, the amount of detail necessary/required when working with csp (i'm an avid csp user) is extremely relevant to working space. Before, I had a lenovo thinkpad that was roughly 12/13" in screen size but now I upgraded to an ASUS TUF gaming laptop where the screen size is roughly 17" and the difference is huge (i had to readjust to the size difference since everything was much more spaced out and less condensed). I also have an ipad, the ipad air 2 from 2020 so I understand how small it is to draw on an ipad with csp (i am struggling as we speak).

Now a bit before screen size, don't just look at the products. See the reviews on customer service and the quality of the products i.e durability and functionality. exclude any remark about "you get this much depth in pen pressure" because nowadays with the technology available it really doesnt matter (especially since you can adjust the sensitivity of pen pressure on almost every drawing program anyways). See reviews on how the accompanying pen functions with the monitor. From what I've heard, huion customer service as well as xppen service can be finnicky but that goes with wacom too. I'm personally excluding wacom as an option at all anyways because it is way too expensive and you shouldn't be getting one unless you're rich rich. I find huion a bit cheaper than xppen and xppen does have a bit more in terms of cosmetics (i.e cute looking monitors) but if you value the overall quality of the monitor and care less about how ur monitor looks then disregard this point.

After screen size, 16" minimum, now you have to consider color accuracy. If you believe that your main hub (laptop, pc, etc.) has accurate colors, having a monitor that is a bit off doesn't really matter. But if your main hub is not the most reliable, definitely focus more on color accuracy.

After color accuracy, consider the price for both and determine whether or not you're getting the same thing for roughly the same. 20-40$ in difference is honestly not too much but anything above 40$ is.
this includes but is not limited to: Viewing/angle adjustability for the monitor (this does get pretty important especially if any of the products say they include a height/angle adjustor or has a built in one), extra commodities i.e you mentioned usb-c port/functionality, warranty (warranty... very important... though i believe both companies have fair warranties last i heard but i could be wrong) 

Personally, I do lean a bit more towards Huion but if XPPen meets your fancy then go for it. (I was actually more towards xppen before but I learned more about huion and reevaluated and compared both companies and the products they were selling). 

i hope this was helpful in any way i honestly dont really know but uh yeah.................... good luck btw!!! i hope you enjoy your first drawing monitor!!!! hope to see more of your art again!!!! and many blessings to you!!!
if it helps you should probably do a checklist for both companies //nod nod

edit: i should also add/mention that if you are thinking of updating sometime soon in 5ish years then you can spend a little bit less, but if you plan on working with this thing for longer than 5 years before upgrading then be more picky!!!!!

I actually got one of the screen tablets but switched it out for an ipad! The reason for me was ... there's way too many wires! It needs 3 different wires to plug into the computer and I got tired of setting it up to draw.

That being said - it works really well! There was little to no latency and the work space was really nice (xp pen).    so if you don't mind the set up it'll probably be worth it!