After playing a month. I can conclude that classic is just  waste of time and money.

Wasting time in raids over countless hours with no loot or pvp in the rotten honor system that take months to rank 14

This is why in retail everything changed. I dont really play it anymore
After playing classic for a month and switch to retail. I was amazed that  i did not get bored after 6 hours straight

If you want to progress for real. Go retail
Classic is meant for nostalgic reason only