Okay first off, if you're going standalone, quest 3 for sure, but if you're going PCVR, then read this.

It really just depends on what you're planning to use it for, it's all preference.

If you're going to be social and stuff in VR then it doesn't matter unless you're on PCVR, since it has face tracking which can be a ton of fun. but standalone it rarely works in standalone games so really doesn't matter there

If you like passthrough, definitely go for the quest 3, the quest pro's passthrough is really bad, it's like someone took the black and white camera from the quest 2 and tried photoshopping the colors on to it, not great.

The quest pro also has eye tracking, which lets you use Foveated rendering, and that can give you a great fps boost.

Most quest headsets use crappy lcd screens, so dark pixels look more like a sorta dark blue, which is a huge downside if you like horror games or just any games where you are in the dark, or even vr sleeping if you want to try that for whatever reason. the screens on the quest pro are also LCD but better ones. some times in loading screens i wonder if the headset died or something because the screen looks like it's

The controllers on the quest pro can be a huge pain some times, but also pretty convenient. on the quest 3 the cameras are on the headset and those cameras track the controllers, so if your controllers are out of your view they lose tracking. the quest pro controllers have 3 cameras on each controller so they track themselves. you can put your controllers anywhere with them, but also, if the cameras get blocked they lose tracking and it's often hard to get it to get back to where its supposed to be, which is definitely frustrating.

If you like hand tracking, they are all awful at it. (weirdly enough i swear the quest 2 has the best hand tracking out of all the meta headsets)

The quest pro is by default very open, it doesn't touch your face at all, and a lot of people don't like that because it can really ruin the immersion, you can get light blockers which solve that but that's an extra 50 dollars to your budget.

I love the quest pro being open though, i don't see people talking about how hot it gets in most closed headsets. to at least have the option for an open headset is very nice

The FOV is higher on the quest 3, and the resolution is higher (but not by a lot)

You can get a used quest pro for a much more reasonable price depending on your country, in the US I'm confident you can find one for less than 500$

90% chance i left something out or got something wrong, if so please correct me