Tons of edgy comments in here about why you shouldn't play classic WoW.
I want you to notice something. Go to
https://www.project1999.com/ right now and have a look at the population. As I write this response to you, there are 716 people on blue. Two months ago, just before classic WoW released, the average number was around 1,200 or so. For summertime, that's an expected number since some P99 players enjoy going outside instead of playing EQ. During colder months, the Blue99 population has been up to 1,800 this past year.
If P99 was truly the superior game to WoW, it would not have lost more than half it's active population. The vocal members you see in this thread, bashing WoW, are the ones most desperate to see their P99 home maintain warm bodies. For without an audience to show their pixel achievements to, can you really them achievements?
Go ahead and play Classic WoW. It's fun and there is a distinct reason it ROFL stomped Everquest and became, to this day, the most subscribed MMORPG of all time. I won't list them all here, no need to. The biggest change between playing EQ and WoW is not having to sink hours of time into a multitude singular tasks. You won't be asked to track rare monster X over 1-72 hours. If you get into a serious issue such as death in the middle of no where, you can still salvage your gear BY YOURSELF. You won't have to beg friends at bedtime to get your corpse and XP back. Again, there's more reasons, but those are the first things that come to my mind.
The most vocal supporters of EQ tend to be players who are already at the top of the gear pyramid. Ask yourself this, do you want to see the end game content of the title you decide to play? Yes? If so, which sounds better; joining a raid at a set time to kill boss X or waiting for a text message that will require you to drop everything you're doing to kill that same monster? The text message could happen while you're sleeping or at work, but once you get it, you have a small window to get that monster before your rivals do.
Which game style is more attractive?
Depending on your answer, that should determine which game you should play.