Well said Wolfglide, I believe the answer you gave is truly an objective one.
SInce I am one of those people who are against VRGtR I have to add that Ravenloft as a setting was created in 1990 a year before I started playing AD&D. I grew up with the old version of the Ravenloft setting waiting eagerly for a new product, with the last 2nd edition product being released in 2000.
Then 3rd edition followed in 2001 until 2005 continuing where the 2nd edition had stopped with all previous gaming material being canon. So you have already 15 years of Ravenloft products detailing characters, places and events. Wizards of the Coast then published Expedition to Castle Ravenloft in 2006, a predecessor of Curse of Strahd in many ways, but not as an official Ravenloft product.
4th edition followed only with articles in Dragon Magazine introducing the Shadowfell as well as some new domains and reintroducing or adapting some old stuff (Strahd, Lord Soth, The Headless Horseman etc). But for reasons I don't know the 4th edition didn't have the amount of previous editions.
With the success of 5e Curse of Strahd the setting was resurrected or for a better word reincarnated into something different, a reboot that changed much of the old lore, events and characters (even the setting itself) that I and some people here grew up with. Some in this forum were already adults even when the setting was first created in 1990, some even played the original Ravenloft adventure when it was released in 1983

.
So around 60+ 2edition products as well as dozens of Dungeon Magazine and Dragon Magazine articles and over 20 3rd edition products are reinterpreted, changed completely or ignored in VRGtR. This is why there is so much beef towards VRGtR in this forum, because it was something a lot of us waited for years but were disappointed with the result.
But as Wolfglide wrote
you choose what is better for your game, without sentimental restrictions as some of us here. Any edition is a new experience to you and you can be more open minded than me in choosing what you feel fits your campaign.
For a full official product list you can look here
https://www.fraternityofshadows.com/wik ... e_Timeline
Since you can't afford to buy more than 1 or 2 books I recommend
Curse of Strahd (the non-racist version, that doesn't depict Vistani as alcoholic thugs), although I don't like some stuff in it (from an in-world "historical" perspective).
it is a good module with many adventures and opportunities to enrich it with free online unofficial Ravenloft products.
If things change and you can buy more I recommend the
3rd Edition Ravenloft Campaign Setting and all the
Ravenloft Gazetteers (I, II, III, IV, V). The Gazetteers are full with Easter Eggs from 2e and established Ravenloft more as a world.
As for 2e there are so many great products or products with "historical" in-world events which is hard to choose, but for sure I recommend the
Evil Eye adventure which I believe is favoured by many. I also like the
Van Richten's Guide series especially the one on
Fiends and
the Vistani.
In the few 4th edition things out there I recommend
Domains of Dread: The Endless Road from Dungeon Magazine #174 and
Fair Barovia from Dungeon Magazine #207 which can be tied up with Curse of Strahd.
As an all-time Lord Soth fan since I began playing AD&D I also recommend
The Life of Soth from Dragon Magazine #416 is a good read for the uninitiated but with not many gaming options.
Enjoy!
PS
As for those old timers on You Tube who praise VRGtR some may really like it and some may just advertise it because they get free products, you never know.