Ive mained tanks my entire time playing WoW, which is Vanilla through BFA, and I can genuinely say playing Paladin in Classic is the most miserable fucking experience I have ever had in WoW.
Ret is fucking miserable trash, seal, judge, seal, oom. Great Spec, if you are solo dont plan on keeping that judgment buff up because you are gonna get parried to shit.
Prot is miserable due to horrific mana issues too. Consecration is expensive, Exorcism drains you against Undeads, Holy Wrath is a 2 second cast time so don't even think about it. To top it all off, the spec doesn't have a taunt.
There was zero logical decision for letting Paladins have more than 1 spec in Classic, all the gear and set bonuses are designed around being Holy.
I wanna fucking die playing Classic Paladin.