If you want to play a stealthy ranger then you should consider the "Gloomstalker", which was not in EA but will be available at launch. It's a very popular, if not the the most popular, Ranger subclass in D&D and fits the description of what you're going for perfectly.
Now, that doesn't mean you can't play a Beast Master who is stealthy. If you had your heart set on Beast Master, then that's fine, pick that and you'll do fine. But in terms of optimization, you will be better at it by choosing the Gloomstalker for stealth purposes. You can also still get spells like FInd Familur and Speak with Animals if you don't want to lose the animal component of the Ranger.
Will I be able to get a companion that Beast Master gets at level 3? I've looked into the other subclasses, but for some reason, I'm drawn to having a proper pet companion haha! 😂
No, you won't get a companion with gloomstalker. So if you set on the raven, I would stick with beast master.
This is true. You can, however, gain the Find Familiar spell and have a raven with you pretty much at all times.
Not only do I play a lot of TT D&D but I'm also going for a very similar build for my first BG3 playthrough. Wood Elf or half-elf will get you the Stealth skill, Charlatan background will get you proficiency in Deception and Sleight of Hand. Then you will not have to pick Urban Tracker and you can pick Beast Tamer for your Natural Explorer choice instead, which is what gives you the Find Familiar spell. Then you of course get all the Gloomstalker spells and abilities like Umbral Sight which essentially just makes you straight up invisible in the dark.
I guess it depends on what's more important to you. If you want to lean more into the stealthy "rogue" aspect but still have an animal companion that you can summon, go Gloomstalker. If you want to lean way more into the animal companion, forest dweller ranger, then go Beast Master with some stealth abilities. It's all a matter of personal preferences.
