Nostalrius Begins - Quality wow vanilla realm (1.12)

Ok so back in the day I played a Dwarf Priest. Raided MC, BWL, Ony, ZG and AQ40 I dont remember the order everything can out in honestly, I was 14 I just logged in a healed stuff most days lol. But I would like to get back into the old days of raid when it was actually a team effort and required coordination. But I am unsure about which server or faction. granted I didnt play any horde in vanilla past like 20. But im sure I could refigure out the quest hubs . So long story short, which server and which faction would be the best to try and raid with? If there is a such or just play what I like? I noticed the pvp server has way more people so I thought that would help my chances. Any info or help would be nice on where to start!

Thank you in advance!
Munki

Let's just check what the actual differences are, and then you can make the choice.

PvP Server:
-Very high population (10k people at peak times)
-Very competitive
-Lots of world pvp (and ganking)
-Lots of raiding guilds
-Balanced factions, in terms of population
-On patch 1.7 (MC, BWL, ZG are out)

PvE server:
-Less people than the PvP server, ~2k during peak times.
-More laid back
-PvE obviously, so no ganking or much wpvp.
-Decent amount of raiding guilds
-More alliance than horde
-On patch 1.5 (MC is out)

Now let's look at the factions.

Alliance
-Paladins and dwarf priests their fear ward make PvE a bit easier for the alliance
-Easy access to all the raids and dungeons, making travel easy

Horde
-Shamans for amazing raid healing and totems for dps boots
-Inconvenient travel to most raids
-No salvation from paladins, or fear wards.
-Pretty great PvP racials (Will of the forsaken, bloodfury, extra stamina)

That's about it really. If you're not into a super populated, competitive server then you're probably better off on the PvE realm. You won't have a problem finding a guild, or groups on either realm.

As a final note, dwarf priests are always needed, and as a dwarf priest it will be very easy to get into raiding.