The first thing to learn about wow classic gold versus Retail is that these are two games that happen to share the exact same assets and a common engine. The experience of playing a Paladin in WoW Classic is entirely different from the experience of enjoying in WoW Retail. Retail is more polished faster, and less grindy, but has a difficulty curve that is different. Classic is slower and requires additional grinding, but can feel much more rewarding.
In both cases, the match is begun by my Paladin with a couple of capabilities. Your assault is affected by seals. My very first Seal, Seal of Righteousness (SoR), inflicts a level amount of further holy damage on almost any mob I hit. I will then cast Judgement a goal to inflict extra damage, but that consumes the Seal (which has to be re-cast and prices mana).
In Retail, I have a fast melee assault on a very long cooldown. Judgment exists in Retail, however it isn't connected to any attack and wow classic gold trade doesn't require that another ability is refreshed by me once I use it.
Favors Retail. Casting Crusader Strike and watching the cartoon drama is more interesting than SoR. SoR adds harm, when it triggers but it does not play with a different attack cartoon. The circulation of battle is different between the 2 games. In Retail, mobs die fast, there's plan or no skill necessary to deal with them. I spend a lot more time waiting for my 2 abilities (Crusader Strike and Judgment) to come off cooldown than anything else.
It becomes immediately apparent that the class was created around the notion that you will heal during battle. Retail animals have hitpoints and kill speed in Retail is quicker than it's in Classic. It can take 15-60 minutes to kill a single creature in Classic, particularly if it's 3-4 levels greater than you. In Retail, this is hopeless -- all animals are the exact same level unless you intentionally enter a zone you are not ready to play in 29, you are. You do get a heal and it'll be scarcely used by you.