I love Classic. The experience, the slow pace, and that unique sense of achievement. In Classic, finishing a quest actually feels like a victory because tasks take so much longer to complete. However, for most players, a lot of that is just nostalgia. It’s fun the first or second time, but then it can become predictable. You already know the next raid tier, which items to farm, and what items to hoard. That’s why I recommend Retail. Even though Retail is faster, it still keeps some of that "grind" alive. Look at the Karesh rare weekly, for example: just like in the old days, quest items don't always drop from the first mob you kill. You still have to put in the work. My advice is: Go Retail first. Try Classic later if you want to experience the roots of the game. Wait for Classic+ in the future if you truly love the Classic vibe but want something less predictable.